A 40% CAC reduction in 60 days is not a bidding trick. It comes from changing what the account is optimising to, so every dollar is pointed at profit rather than at a platform metric that only looks like profit.
The constraint.
The account was being run to platform-credited performance, which over-stated how well acquisition was actually doing. Optimise to a flattered number and you scale the wrong things and starve the right ones. The cost shows up as a CAC that will not come down and profit that does not follow revenue.
What we changed.
We moved decisioning onto honest signal and reconciled it against contribution profit, then concentrated structure and creative behind what was genuinely working. When the account optimises to profit instead of to credited revenue, CAC falls and the saved margin drops to the bottom line.
The outcome.
CAC fell 40% and profit lifted 4.5x inside 60 days, capped by a record end-of-financial-year result. The revenue line moved, but the result that mattered was profit, because that is the one the business actually keeps.
A CAC that will not fall is usually a measurement problem wearing a media costume.
Point the account at contribution profit instead of credited revenue and the cost to acquire tends to drop without touching the budget.
