Too many agencies chase a ROAS screenshot to prove they’re doing good work. High ROAS doesn’t always mean high profit, and it certainly doesn’t make an agency a real performance agency on its own.
ROAS is one metric, not the metric
Relying only on ROAS is risky for a few reasons: it ignores backend costs like COGS, fulfillment, and retention; it says nothing about whether a client is actually profitable; and it can be manipulated fairly easily — targeting only warm traffic will inflate it without reflecting real growth. Plenty of self-described “performance marketers” hit a 4x ROAS by reselling to existing buyers. Real performance means driving new growth, not recycling conversions that would have happened anyway.
The metrics that actually matter
New customer CAC — are new buyers being acquired profitably, not just existing ones being re-marketed to? Contribution margin — does the client make real profit after ad spend and cost of goods, not just on paper? Customer lifetime value — is this building scalable value over time, or just short-term returns that reset every month? Blended ROAS — what does the picture actually look like once organic, email, and retention efforts are factored in alongside paid?
These are the numbers that make an agency genuinely indispensable to a business, rather than just a media buyer with a nice-looking dashboard.
Performance means profit, not just purchases
An agency calling itself a performance agency while only talking about CTR, CPC, and ROAS is missing the point. The fuller picture asks whether the business can actually scale at its current margin, whether it could absorb a 20% CAC spike and still come out ahead, and whether the offer is priced for real growth or just for a good-looking dashboard.
Further reading
Meta’s own guide on optimizing for business goals is a useful companion resource here.
Related reading on this blog: