For me, it was two things: 1. I saw lots of problems that I had ideas about (ideas that I'd pay for if they existed). A business was - is - the only way to imp

For me, it was two things: 1. I saw lots of problems that I had ideas about (ideas that I'd pay for if they existed). A business was - is - the only way to implement those improvements and discover whether they actually helped other people as much as they helped me. 2. While I enjoyed working on problems for other people, other stuff - broadly, poor execution by parts of the business I didn't oversee - got in the way. #1 led me to implement many things over the years (businesses, projects, whatever), but #2 was basically the catalyst to do it full time.