I think it's not all that clear with the question. How much money? If we're talking about money you get from your regular job and you feel okay about working for someone - then the answer is yes. If you feel you don't like working for someone and will only be happy working on your own stuff - then the answer is "not necessary". From what I've seen and heard, good money is a result of different (for each person) combination of professional skills, business skills, persistence and luck. And you never know if your combinations' going to make you rich.