I think the key to making money, is to find something people charge a considerable amount for and then do that thing for a lot less. I had a friend who was an medical intern studying to be a surgeon, and I asked if he was interested in doing orthopedics. He said no, orthopedics wasn't surgery, it was carpentry. I'm a pretty good carpenter, I even have all the tools. So I opened up my own orthopedics practice.
Apparently there's a little more to it than that.