You won't get to fuck 20 (time and logistic constraints) but they usually keep a positive sp:client ratio so you will get to dance with a few ladies likely. I went to a similar one in MTL and it was the most intense, most concentrated carnality I've ever been a part of, almost to the point it was overwhelming at times. Getting blown by a woman who is getting fucked from behind while you finger another as she's french kissing you and bobbing her friend's head down on your dick is how it started and it only got crazier from there. So yeah, the cost is a thing, but so is the experience.