I've done three money makers... the thing all have in common is I showed someone something I was working on, and they said they'd buy it: 1. I wrote some embed

I've done three money makers... the thing all have in common is I showed someone something I was working on, and they said they'd buy it: 1. I wrote some embedded software and got paid a royalty on every device shipped. Wasn't much per device, but it added up to thousands per year for about 20 years. 2. Started a niche credit card processor and it's made money for 15 years. 3. Put a bunch of T-shirt designs (featuring silly cartoons for error messages) on craft sites. It made money, but fashion burns out quickly compared to code. Right now, I'm working on something I've always wanted to do, and haven't had time for since the early 90s... writing a game. We'll see how it goes.