As Screenman said, earning as much as you will in a well-paid job from a small business is very difficult. My sister is an accountant who at one point had an ambition to start a cake/ coffee shop. She did her sums and business plan very carefully and came to the conclusion that it just wasn't financially viable. In fact the best way of doing it would have been employing a manager with a catering background. She would have got someone with lots of experience, probably much better equipped to manage that kind of environment than she was, for less than half the salary she was on at the time.