Although I don't disagree with your point, I know of some ladies being shrewd with their finances, purchasing assets such as condos or stocks, leaving the luxury items as potential gifts from clients. They up their rates or tip expectations and we keep playing. And should we stop visiting a lady, the monetary increase absorbs the drop in clientele, saving the wear and tear on their hands, mouth and pussy.
This is an industry similar to sports where young are needed to replenish the pool, fresh meat. And as one establishes herself, ups one's rates until they are the old vet just looking for an minimum contract.
Getting back to the shrewd ladies, eventually they accumulate enough wealth to retire from the industry or semi-retire seeing a few clients for spending money.
And back to the main topic, I agree tips are becoming ridiculous. One can move from the spa scene's top establishments, looking for bargains in B and C class spas. The lady may be older or appear not as classy; but there is value. And the most important point, agree to services and price up front. There is no need to play a game of The Price is Right.