Hiring a performance marketing agency can give a brand access to deeper channel expertise, more testing capacity, better technology and the ability to scale without building a large internal team. The tradeoff is that you're bringing an outside partner into decisions that directly affect your media budget, customer acquisition and growth.
So, are performance marketing agencies worth it?
For the right brand, absolutely. But an agency isn't automatically better than an in-house team, and hiring one doesn't solve every marketing problem. The value depends on what you're trying to accomplish, what capabilities you already have internally and, most importantly, whether the agency is actually equipped to solve the problems holding your business back.
Let's get into the pros, the cons and the questions worth asking before you make the call.
The Short Answer: Performance Marketing Agency Pros and Cons
The biggest advantages of working with a performance marketing agency are:
- Access to specialists across channels and disciplines
- Greater testing and execution capacity
- Experience gained from solving similar problems across multiple brands
- Access to platform expertise, technology and partner resources
- The ability to scale without hiring an entire internal team
- More opportunity to connect media, creative, commerce and measurement
The potential disadvantages of working with a performance marketing agency include:
- Less day-to-day control than a fully in-house team
- Agency fees on top of your actual media investment
- The possibility of getting a less experienced team than the one that pitched you
- Ramp-up time while the agency learns your business
- Misaligned incentives if goals and compensation aren't structured carefully
- Reporting that can over-index on channel metrics instead of business outcomes
None of those cons are inevitable. But they're exactly what you should be vetting for.
Pro: You get Deep Expertise Without Having to Hire Specialists for Everything
This is probably the clearest argument for an agency. Performance marketing isn't one job anymore.
Paid search is a discipline. Paid social is a discipline. Amazon and retail media are their own worlds. So are programmatic, measurement, feed management, performance creative and marketplace content. And within each of those disciplines, platforms are changing constantly. Building that depth internally means finding, hiring and retaining a lot of different people.
An agency gives you access to those specialists without recreating the entire structure in-house. And specialization matters more as your marketing program gets more complicated.
Amazon is a good example. Running Sponsored Ads is only one piece of growing on Amazon. Media performance is affected by your catalog, PDP content, organic visibility, inventory, pricing, reviews, DSP strategy and more. At Code3, we have an entire team working across Amazon, Walmart and other retail media networks because there simply isn't one person who can be an expert in all of it.
The same logic applies across paid media. The person building your Meta strategy doesn't also need to be your Google Search expert, Amazon strategist and measurement lead. What matters is that those people aren't operating in isolation.
Pro: You Get More Capacity to Test, Learn and Move
Good performance marketing requires a lot of testing. Not random testing, and not launching 30 ads and hoping something sticks. Actual testing: a hypothesis, a variable, enough investment to learn something and a plan for what happens next.
That takes capacity.
The right agency should already have processes for things like creative testing, audience strategy, budget allocation, campaign optimization and reporting. Instead of building those systems from scratch, your internal team can tap into an existing operating model.
There's another advantage that's harder to put on a staffing spreadsheet: pattern recognition.
An internal team knows your brand better than anyone. But an agency sees what's happening across different brands, categories, platforms and business models. That doesn't mean something that worked for Brand A should automatically be copied for Brand B. It means the agency has a larger pool of successes, failures and platform changes to learn from.
That perspective can make it easier to identify what's actually unusual in your performance and what's happening everywhere.
Pro: A Good Agency Can See Beyond the Channel
This is also where we'd draw a pretty important distinction between a media-buying vendor and a performance marketing partner. If your agency's entire job is to make Meta ROAS go up, it can probably find ways to make Meta ROAS go up. But that doesn't necessarily mean your business is growing.
Maybe you're capturing customers who would have purchased anyway. Maybe branded search is getting too much credit. Maybe your highest-ROAS Amazon campaigns are mostly defending demand that already exists. Maybe your acquisition numbers look great while new-to-brand growth is flat.
Performance gets much more interesting when you stop asking, "Did this channel hit its KPI?" and start asking, "What actually caused the business outcome we wanted?"
That's why the strongest agency relationships connect media decisions with creative, commerce and measurement. Code3's own model is built around bringing strategy, media, commerce, creative and measurement together rather than treating them as separate problems.
The agency should still care about ROAS, CPA and conversion rate, of course. Those metrics just shouldn't be where the conversation ends.
Con: You're Giving up Some Control
There is no way around this one.
An in-house team sits inside your company. They're in the meetings. They know why a product launch got pushed two weeks, why legal hates a certain claim and why the CEO suddenly cares about a category that wasn't on the roadmap three months ago.
An agency has to learn those things, which creates the potential for slower feedback loops, more communication and decisions that don't have the same institutional context an internal team naturally has.
The solution isn't 14 status meetings a week, it's good governance. Both sides should know who owns what, what the agency can change independently, what requires client approval and how quickly decisions need to happen.
And the client has responsibilities here, too. If every creative concept takes three weeks to approve, the world's fastest performance marketing agency isn't going to give you a fast creative testing program.
Con: The Team You Meet During the Pitch May not be the Team You Get
This is one of the most important things to ask about when evaluating agencies.
Who is actually working on your business? Not just the executive sponsor or the person presenting the pitch. Who is making the decisions every day?
Ask who owns strategy, who is actually in the platforms, how senior those people are, how accounts are staffed and when senior leadership gets involved, and do a chemistry check by meeting the team. The name on the agency door matters less than the people assigned to your business.
Con: An Agency can't Fix Every Problem with Media
This one may be the most overlooked.
Sometimes media isn't the problem. If your product isn't competitively priced, your PDP doesn't convert, your offer isn't compelling, your inventory is constantly unavailable or customers don't understand why they need your product, better campaign optimization only gets you so far. In fact, spending more can make the underlying problem more expensive.
A strong performance agency should be willing to tell you when the answer isn't "buy more media." If every problem somehow results in a recommendation for more advertising, that's worth paying attention to.
What About Agency vs. In-House vs. Hybrid?
There isn't one right model for every company.
An in-house model gives you maximum proximity to the business, institutional knowledge and direct control. It works particularly well when you have enough scale to build deep specialist teams rather than asking a handful of generalists to cover every channel.
An agency model gives you specialization, capacity and exposure to a wider range of platforms, tools and marketing challenges without requiring you to build all of those capabilities internally.
A hybrid model combines the two. And hybrid doesn't have to mean the brand does the thinking while the agency pushes the buttons.
A better division is based on where each team has the strongest context and expertise. Your internal team may own business objectives, financial guardrails, product priorities and organizational context. Your agency can bring channel expertise, testing strategy, cross-market perspective and execution depth.
Strategy should be shared. That's usually where the best partnerships happen.
How to vet a performance marketing agency
If you're evaluating agencies, these are the questions we'd spend the most time on.
How do you define success?
See how long it takes them to get beyond ROAS. They should want to understand your margins, customer acquisition goals, growth targets, incrementality expectations and other business realities before telling you which KPIs matter.
Who will actually work on our account?
Get names and roles if possible. Understand the seniority of the team and how specialists are brought in, and ask to meet the core team, if possible.
What happens when performance is bad?
This question can tell you more than asking for another case study. How do they diagnose a problem? What gets examined first? When do they change creative? When do they adjust media? When do they tell you the problem may exist somewhere else in the customer journey?
How do you approach measurement?
Ask how they reconcile platform-reported performance with broader business results. Depending on your business and investment level, that could involve incrementality testing, marketing mix modeling, lift studies, Amazon Marketing Cloud or other measurement approaches. The important part is that they understand attribution is not the same thing as causation.
How do media and creative work together?
"Send us assets and we'll run them" isn't much of a creative strategy. Your media team should be generating insights that influence the next round of creative, and your creative performance should be influencing media decisions.
Can you show us what you actually changed?
Case studies should explain the problem, the strategic decision, what changed and what happened next. A screenshot showing a huge ROAS number isn't a strategy.
What should the first 90 days with a performance marketing agency look like?
Don't judge a new agency partnership solely by whether ROAS went up in month one. The first 90 days should establish the system you'll use to make better decisions long after onboarding ends.
First 30 days: Align on business objectives and KPIs, audit measurement and tracking, understand historical performance, review creative and commerce fundamentals, and identify the biggest opportunities.
Days 31–60: Start executing against those priorities. Launch the highest-value tests, establish your creative testing cadence and make sure reporting is answering actual business questions.
Days 61–90: Look for patterns. What's working? What isn't? Which assumptions were wrong? Where should budget move? What have you learned about customers, creative and channels that should influence the next quarter?
By day 90, you shouldn't just have campaign results, you should know more about how your business grows.
So, is Working with a Performance Marketing Agency Worth it?
It can be. A performance marketing agency makes the most sense when the value of additional specialization, execution capacity and outside perspective outweighs the additional cost and complexity of managing an external partner.
But don't hire an agency because you need someone to "run the ads." Hire one because you need capabilities your current structure doesn't have, and then hold that agency to a higher standard than making dashboards turn green.
The best performance marketing partnerships connect what happens in the platforms to what's happening in the business. Media, creative, commerce and measurement should be informing one another, with both the brand and agency working toward the same definition of growth.
That's also how we've built Code3. We work across media, creative, commerce and measurement because performance problems rarely stay neatly inside one channel.
If you're evaluating whether an agency, in-house or hybrid model makes the most sense for your brand, we'd be happy to talk through it. Get in touch with Code3.