I've always wanted to run my own computer repair business, and be my own boss, though truthfully, I don't think I would be able to juggle all of the different aspects of running a proper business, like managing finances, marketing, or even managing a proper schedule. I could totally see myself having some days where I'm like "sorry, I don't feel like working, the shop's closed", and other days where I blatantly violate work safety regulations by working on a single problem for hours at a time without taking regular breaks.
If I were to run a business, I would have to have people working under me, and that opens its own can of worms because it means I would have to deal with coworker interactions, putting everyone on a proper payroll, and all of the other things that go with hiring people to work for you. This would pretty much defeat the purpose of me starting my own business.