Everyone optimizes the cost of the test — sends, ad spend, hours — and almost nobody prices the decision the test feeds. Kill an offer at 20 non-replies and you don't bank the 1480 sends you skipped; you pay them back later, multiplied by every month the real winner stays unfound. Reply rate needs ~1500–2000 sends per variant before it can say anything at all — below that floor you aren't reading a signal, you're reading your own patience. Fifteen years of B2B practice compressed into one file an agent can actually read: the skill is free, the test it stops you from wasting is not. Rare knowledge, cheap to take — install is one command: npx skills add axelfreeman/marketing-mindset (docs: https://axelfreeman.github.io/marketing-mindset/). Which decision in your queue right now is sitting on a sample too thin to trust?