Penny wise/pound foolish

In Desires a very attractive dancer, whom I had never seen, came over, introduced herself and sat down. Bought her a cocktail and later water for her friend and when she asked if I wanted a couple of dances, I said sure, 2 topless. Had she been less attractive, or less impressed with herself, I would have gone for a room, but something about her made me choose the two dances. Stood in front of the $25.00 per dance sign and paid the man $10.00 for 2 dances. The dancer keeps the rest. She starts a third of the way through a song, so I know I am being short-changed on a song, even though it took her almost the rest of the song to remove her top. After 2 ok songs, she asks how many more I want, and I say all set. having paid $10 of the $50 already I give her $45 and for the first time ever a dancer says its $50, you only gave me $45. I say, fifty like on the sign where you pay the bouncer? She responds you owe me fifty. I don't fight over money so I grab another 5 and she says you can also tip me $10.00. My response to this demand is always the same: "no thank you". It's a puzzling response, but it kills the conversation 100% of the time.
So she got me for $10.00, with the hope of screwing me out of $20.00. Penny wise. An hour prior I had 4 jacks at the casino when someone bluffed me with an all in lol. If her dances were better, or if she wanted a new customer and was fair, she was looking at $200+. Pound foolish and on my do not dance list forever, despite being a truly awesome spinner.