Stick to your regulars if there's chemistry both ways.
This is not the first time you complained about rudeness by escorts.
Remember most escorts (specially while visiting a new city) are overwhelmed by the number of text messages they receive. Have you tried talking on the phone with them to see how they treat you? Yes I know... some refuse to talk on the phone.
400 is NOT the new norm but if some ask for it is because clients are willing to hire THEM.