I guess that depends on what you mean by "successful." If you mean, making a living at it, I do not know anyone that does that. I'm sure some people do, I just don't know any of them personally.
I feel that I am successful in that I enjoy playing, win enough that I never have to make deposits, and I take regular withdraws. I don't make anywhere near enough to live on, but I get paid to have fun. And I would call that a Success!
How about you?