I just bought a copy. I'd considered it before but it wasn't worth $20 to me. Even $1 from a person who would never have bought it before is a net win - they

I just bought a copy. I'd considered it before but it wasn't worth $20 to me. Even $1 from a person who would never have bought it before is a net win - they probably don't have many expenses associated with sales (support etc) so it's pure profit, with the additional benefit of marketing.