That's because she only sees you as an atm machine..The mood changes once you give her a drastic smaller tip. Just try it a couple times on one of your regulars and slowly take note of the shift in her mood and services..Or she could be tired of seeing you again for the one thousandth time because she already knows what you like and it's now seen as boring for her.. I know cause I've been there (just recently) and it hurts..
Now, I can totally understand why the machismo guys on here only view sex workers as whores/hoes and leave personal feelings for them aside. Once you give an MPA your confidence aka trust that's when they can really fuck you over..Just fuck them, shower, bye and leave. Nothing more nothing less..
The sex chicks just need money and nothing else..Personal feelings is not even on their radar. They got other things in their own lives to worry about.