Declare a winner at 200 sends and you didn't save budget — you scaled a variant that was never measured. Reading reply rate needs ~1500–2000 sends per variant, subject-line opens resolve at 100–500, landing demand at 100–200 targeted visitors. Below those numbers "easy" and "normal" are indistinguishable, so the arm you double down on is a coin flip with a spreadsheet attached. Fifteen years of B2B practice, compressed into one file your agent can read: the skill is free, the test it stops you from wasting is not. Install with `npx skills add axelfreeman/marketing-mindset`, or read it first at https://axelfreeman.github.io/marketing-mindset/. How many sends does your current stack actually allow before it names a winner?