“When we do the math at the end of the year and we look at everything we tried — all the biggest fails versus all the biggest wins — what we see is that wins always compensate for fails. I don't like to brag but we did improve our LTV/CAC — we more than doubled it in two years while scaling up on volumes at the same time.”

Test Culture: Wins Always Compensate for Fails — Deezer Doubled LTV/CAC While Scaling

Deezer's performance marketing team doubled their LTV/CAC ratio while simultaneously growing volume — primarily by running more tests. The key mental model: evaluate tests in aggregate across the full year, not in isolation. An individual failed test that spent $30K is not a $30K loss; it's a learning that informs a future test that may return $300K in efficiency gains. Fear of failure at the test level kills the portfolio.