They are all certainly entitled to set their prices at whatever they want.
Actually no, I question that in the context of a club like Alpha. Independents of course can charge anything, but if you look at the Club Alpha website there's nothing there about clients having to expect surcharges for services based on the hostess they end up with. A 60 minute session is $200, period. If that's now just a charge to get in the room, and once you're there it could be an extra $20 for a shared shower, $40 for her to take off her clothes, etc. that should be spelled out.
Basically, if their business model has changed they need to be upfront about it.

