I think it probably varies by location just like anything else. A lap dance in NYC i would assume would cost more than a lap dance at a strip club in a much smaller city. Or at least I would think
Also, similar topic, but I've often thought that American strippers must make less than Canadian strippers.
In the US they get slipped $1 bills, whereas here our smallest bill is a $5. Unless you start using change, but that entirely redefines "coin slot"!