Lol, it seems like you watched to much tv or movies.
Most drug dealers are not wealthy at all, it's more like the opposite really. Most small time dealers make much less than a minimum wage. It's only when you deal with big volumes that you make decent money, only the people on the top get rich.
And that's only when you are able to work your way up before getting caught by police or shot death. Most don't have enough street knowledge to survive in this business. They didn't listen to biggie's 10 crack commandments.