OK so I'm clearly playing devil's advocate in an environment where the abiding opinion is that all working girls earn a fortune, sting guys for extortionate fees, and at the end of the day the good ones are just the best actresses.
I have one word for you of that opinion...bollocks.
Yes this industry is a minefield from the arse end of the market for a massage and a hand job to the elite degree educated, gym toned, true 'escorts'.
I will not be drawn into the negative opinion that working girls are just ripping me off...in fact I know well enough to recognise a real pro when I meet one. In any situation I will tip for good service, restaurants, cabs, hotels, barbers, maitre d's, escorts - not excessively or flamboyantly but enough to acknowledge a service well provided.
Guess what? Wherever I tip I get far more back over time.
So, if you get a good service, try a small tip, you might just be surprised.
If all you are going to do is negotiate bargain basement prices dont come crying with negative reviews when you get a budget price service.