It depends on the club and the laws. Most of the clubs where the clubs rips off the girls are clubs where you pay a fee to work. For example, there is a popular local club around here that charges you: a tip in, tip out, late fees and will fine you for the smallest thing. So on the weekend it would be $35 tip in, $100 tip out, $20 for each hour you arrive after 8 and will fine you $50 if you get off of the step with no thongs. So by the end of the night you can owe the clubs well over $200 before a dime goes in your pocket.
Other clubs charge no fee but just take a % of your dances. I like this b/c it means if you don't make any $ that night you don't have to pay to be there and all the stage money is yours.
Also, there are clubs that just charge you a set fee (no fines or late charges). However, if you don't make any money you could be looking at an L which is why I like the pay per dance route.