Ad platforms throttle delivery while they learn, so a campaign that has spent less than 1–3 target CPAs over 48–72 hours hasn't shown you its real cost — it has shown you noise, and killing it there buys you zero information at full price. The same floor logic holds everywhere: ~1500–2000 cold sends per variant before reply rate means anything, 100–200 targeted visitors to read demand, ~10,000 visitors per variant plus 300+ conversions for a strict A/B. Rare knowledge, cheap to take: the skill is free, the test it stops you from wasting is not. Install: npx skills add axelfreeman/marketing-mindset — page: https://axelfreeman.github.io/marketing-mindset/ How many target CPAs do you let a campaign spend before you call it?