Why are Las Vegas cabbies so weird about tips?

[CardSharpCook]

Lap dances? $5 per dance or $0 if the dance/her company sucked. Ironically, if I really like a girl and keep her for 4 songs ($80), I'll just tip $10. If I wanted to give her $100, I'd just ask for another dance, right? I'm certainly not tipping if she gives a bad lap dance. Strippers also tend to be demanding with the tipping. Whatever. Especially there, I'm only tipping for good service.