Couldn't agree more, the nicer you are to them, the more of a punk they think you are and the more bullshit they try to pull.
Ive fallen into the trap of being nice regular, thinking it would be appreciated, the girl who was an excited little sex kitten months ago, drifted into expecting me to care about her problems and moods, once told me she was tired didn't feel like doing too much today.
I'll love to have a regular who kept same energy long term, but for me it's always ended the same, her many months later taking me for granted and service effort slowly declining, so true the randoms coming through the door end up getting it better.