I've made at least $14,000 selling videos on this blog, probably way more. It doesn't take a lot of work. I've developed an incredibly simple system, which I'm giving away here for free.
Are you a hacker who likes to make music? You know how you feel precise control when you write code you understand, but you have to filter your understanding of your music through oversimplified GUIs which sometimes have terrible UX? I made a series of videos which teaches you how to write music sequencing software in Node.js and CoffeeScript. When I do it, I experience a clarity which makes it easy for me to make more exciting sounds. You may have the same experience. Upcoming episodes will also teach you how to use simple probabilistic artificial intelligence to write code which writes its own music (which I've already done in Ruby).