AMPs all seem to be pretty much the same price, $70/hr of which the girl gets $25 I think, and then $50 topless HR. Other extras are of course more if that's your bag.
One of the reasons quality can vary is the owner makes 37.5% to cover GST, rent, repairs, phone, reception etc etc and the girl makes 62.5% plus tips. Some might see that as a bit too much of a risk as an owner as the council can close you pretty much anytime if they get a lot of flak. If the average job is 30 mins the % swings even more to the girl.
Of course the customer wants the best deal, but $75/hr to pull your top down and play with someone's tackle, although not what your mother would want as a career option, is still good money. Now I know the girl might only get 3 jobs a day, but for 5 days that equates to $1125/week, which a tax payer would need to earn $76.5k a year as a salary.
Doing some quick maths, that is what the owner might end up with too in a fairly normally run AMP, so bottom line is if you want to earn big bucks....this might not be the golden goose you thought.