Overcharged, not sure I'll ever learn

Another trip to Pandoras, it had been about six weeks since I've been there. As usual, I had a couple girls in mind when I went. Anya was the only one I saw working there that I've had great experiences with but she was busy. I met a nice looking girl who met all my 'checks'. Nice body, a bit of curves but just right (I like thin), blonde, perfect natural breasts, and nice looking. I talked to her, she's eastern european, back to work after gone for a while. Martina.

We went in back and she worked slow, methodical and i liked that. on the 2nd song I introduced her to my dick and she played with it for the remaining two songs. Very nice really. But wanted $160 for the 3 songs - 40,60,60. I called bullshit but it's uncomfortable so I gave her 140.

Am I wrong or is this stupid by the girls? I'll never see her again. She gets written up on this review site and I am sure lots of others wont repeat with her. Wouldn't she do better by charging 3/100 or something and getting repeat business? Or was she taking advantage of me since I told her I only come once a month or so.