The strip clubs don't compete, not here in NYC. You have to audition. They pick you.
The business behind it is actually kind of interesting. The girl will audition, they get accepted and then they pay a house fee (usually around $100) to work there. Sundays are typically house fee free. Everything else is based on tips and the girls have to tip everyone: bouncers, house moms, makeup (if they don't do their own).
And it's really a scaling issue. I'm guessing (and I'm just guessing) that the median income for a stripper in a particular area is directly related to the median income for that area.
Also, a lot of girls travel to work, between NYC, Vegas and Los Angeles. Also, Miami is pretty big.
You don't need to be a super model to work at the "top flight" clubs in NYC either. I have photographic evidence of that. You do need to have some hustle to make a lot of money though, and a casual disdain for men doesn't hurt either.
I would most certainly NOT recommend it as a career for people. I think it has the capability of ruining healthy sexual attitudes in people. It certainly made my relationship much harder.
That being said, a lot of these girls have very few options that provide the sort of income and lifestyle flexibility that stripping offers. My ex-wife supported her entire family with it. Could she have done something else? Maybe, but she didn't finish high school and her family required her support. What career can someone in her situation take on that offers 90K+ for 4 days work without a high school diploma?
It's really interesting too because the entire perception of stripping is so culturally rooted. Where she is from (Japan) it's no big deal. It's another job, like being a hostess girl. Not something you wear on your sleeve, but not something you necessarily are ashamed of. Of course, being American, nobody in my family knows or knew - that would have been a disaster.