Raising prices keeps the number in check (supply and demand), which keeps her earning as much, without having to service 15 guys a day.
Most regulars of any lady want her at her best, and will follow and pay for that experience.
Some ladies understand this principle, most guys don’t. It’s really simple, you don’t like a lady, a spa, due to high price or lack of service, go somewhere else that fits your needs, if you can find it.
I’m amazed of so many guys who always want the Steak from the Keg (KJ just had one recently), at the McDonalds hamburger price.
Not to say I don’t enjoy a cheap hamburger some times, but I certainly don’t complain online about the steaks at the Keg costing more.