I'm curious, if you can share any small side-project you've worked on that has turned profitable (eg. makes at least 50$/month or so) and is not a SAAS app.
I started the project by selling my old law notes from Oxford law school online, and, after a lot of work, the project makes enough money to meet my basic needs.
I've just added a commission-based system so if anyone, particularly smart Hacker News types, has typed up notes from college (their own material, not lecture handouts), I'll share the profits with them.