If you've ever worked in a casino, you know that NOTHING is allowed to interfere with casino profits. Those shows, restaurants, shops, brothels, xxx performers and anyone else in the casino is there strictly to attract paying customers to the slots and tables.
That, by the way, is one of the most unrealistic parts of this game. The dealers at the tables should be raking in more money than the casino whores. Easily.
Perhaps inexperienced dealers should earn less than inexperienced whores, but at some point, experienced dealers should earn more than experienced hookers.