The Gap Between Performance and Profit

A recent survey from Gartner demonstrated that nearly half of all CMO’s struggle to prove to the board that the marketing campaigns they’re responsible for are actually profitable. That’s a damning statistic but it’s not one that necessarily reflects badly on the CMO. They’re not doing bad work, they’re simply measuring the wrong things and reporting PPC performance to the wrong audience.

Whether marketing is making the business money is exactly the kind of information a chief financial officer wants to know but it’s one that a ROAS number won’t answer. ROAS tells you how much the platform claims to have generated against what you spent on ads – but it says nothing about margin, reveals nothing about whether those customers were new, and fails to give any insight on returns or cancellations. You’re answering a question that nobody in the boardroom actually asked. 

Why ROAS gives you the wrong answer

The key point here is that Ad platforms optimise towards the signals you give them. Nothing more.

If you ask Google Ads to hit a 500% ROAS target, it will find the easiest, lowest-risk way to achieve that. That often means prioritising existing demand, brand traffic, or users who were already likely to convert.

What it won’t tell you is:

• Whether that activity is incremental
• Whether higher returns were available at different spend levels
• Whether that return actually translates into profit once costs are applied

ROAS is not a measure of efficiency. It’s a constraint.

There’s another element to this that rarely gets talked about. Even if ROAS is hitting the target consistently, that doesn’t mean additional spend is generating additional profit. If your incremental ROAS is at 100% but your margin is 50%, you’re losing money on every extra pound you spend. The platform won’t point that out. Instead it will keep reporting a healthy return because that’s what you asked for. Knowing where your marginal efficiency curve flattens – the point at which spending more stops generating proportionally more – is the difference between scaling profitably and burning budget on impressive-looking, but ultimately misleading figures. 

The attribution problem

Platform-reported performance is not neutral. It is directional and, by design, self-attributing.

Each platform uses its own attribution model and each one is incentivised to claim as much value as possible. The result is consistent over-reporting when compared to actual business outcomes.

This becomes obvious when you reconcile platform data with financial data.

A campaign might report £250,000 in revenue. But once you account for returns, cancellations, discounting, and unfulfilled orders – the realised revenue, let alone profit, can look very different.

Platforms optimise against what they can see.
Your business operates on what actually happened.

Bridging that gap is where most performance strategies fall down.

Start with understanding your business

It’s important to understand how the specifics of a business work. That means identifying how they make money, what they care about, what they actually want to drive. The metrics that ad agencies like to shout about give a skewed picture of what really matters – one simple step to close this gap is to listen in to sales calls. It will make it easier to understand the sales team, how they operate and how they make a sale. That’s gold dust because it gives a blueprint from which you can drive the strategy of the marketing team.

If it’s not ROAS that you should be focusing on, then what is it? It’s a question with more than one answer. You need to know what your business’ North Star KPI is. It might be profit, revenue or new customer acquisition. When you identify the North Star, the rest of your strategy filters down from that. What data underpins it? Is your conversion tracking set up to capture it? And how do you utilise it within a campaign?

What profitable performance marketing actually looks like

That tricky conversation with the chief financial officer in which you attempt to justify your existence need not be a fraught, one-way conversation. The metrics that resonate in a boardroom are not platform metrics – they are profitable growth, new customer acquisition and lifetime value. These are the numbers that connect what good marketing achieves to what a business leader cares about. If you show the boardroom that you’re measuring the right things and connecting campaign data to the balance sheet then you’ll not just run better campaigns but you’ll turn marketing into a genuine growth driver.