Performance marketing doesn't optimize for growth. It optimizes for the short-term measurable result, and that's not always the same thing as sustainable growth.
“Optimizing for the lowest cost per lead doesn't optimize for the best customer. It often optimizes for the cheapest customer to convince and the easiest to lose.”
Otto GTM ObservatoryPerformance marketing excels at measuring and optimizing short-term results (clicks, leads, immediate cost per acquisition), but this same strength is also its limit: an algorithm optimized for the lowest cost per lead tends to find cheaper segments to convince, not necessarily those generating the most long-term value.
In B2B, where the sales cycle is long, performance marketing must be integrated with an LTV-per-channel view, not just CAC: a channel with higher CAC but much higher LTV can be more profitable than a cheap channel bringing low-value, high-churn customers.
Common mistake: evaluating performance marketing campaigns only on cost per lead or cost per click, without linking it to the long-term value (LTV, retention) of customers acquired from each channel.
Second mistake: allocating the entire acquisition budget to tactical performance marketing, with no parallel investment in brand, getting diminishing returns as low-cost segments run dry.
A company optimizes campaigns for the lowest cost per lead, achieving a €40 CPL, but customers generated from that channel have an average LTV of €3,200 and 34% churn in the first 6 months. Reallocating budget toward a channel with €95 CPL but €18,000 average LTV and 8% churn, net return on acquisition investment more than doubles despite a higher cost per lead.