For The Mom Test, I earn approximately $17 per paperback ($30 retail price, 55% royalties after accounting for printing costs), $7 per ebook ($10 price, 70% royalties), and less than $3 per audiobook (since they’re usually bundled into an Audible subscription). But due to the popularity of audiobooks, and despite driving less than 10% of my total profits, the audiobook represents over 30% of my “readers.”
