Define "own business": I guess if you are looking for multi-million dollar businesses being run in someone's spare time, yeah, you won't find many examples. But what about the guy who simply wants to have a second source of income by running something in his spare time? Plenty of examples of people who turn a hobby into something that resembles a business. Plenty of people earning a second income by trading something, creating something. How much revenue is enough? 5K / month?