I think it's all an issue of the local-market, different cities have (a) different prices and (b) different expectations of service-level per price. One great thing about the sex-industry is that some places consider a certain service to be MORE whereas other places consider it to be LESS. So, for example, a lap-dance in some towns near-ish to Tampa, Florida, is MORE expensive than a hand-job from most willing dancers. Whereas in most cities, the lap-dance is LESS expensive, and the hand-job is a price-point up from it, and then the blow-job is another price-point up from that.
Weirdness, how different places have their own Zeitgeist about certain services. In fact, if you think about it, a hand-job which lasts about two or three songs' worth of time and which does actually get the guy to finish, presuming he isn't a really difficult cum, is certainly less work than lap-dancing for the same amount of time.
I used to receive spontaneous hand-jobs from many of the girls I was "regular" customer to, back in one city where I lived, simply because they (so it seemed) were comfortable with me, were interested in keeping me coming back the next night and the next because I'd be spending money, and were likely just as horned-up about sexuality (they were drinking, partying, etc.) to at least SOME degree as I was.
I fondly recall one dancer of my past, and this story. She was really seeming to get into the lap-dance she was giving me, grinding some, but also moaning and standing back to pose, and rotating to look at herself and how hot she was in the mirror. Kind of an up-and-down motion of her whole body got going, lasted about two songs, and during that time she was simply grasping my (entirely exposed) cock and moving up-and-down with her hand about at the same rate as the up-and-down of her whole body. The moaning was very stimulating to me; the way she was glazed-eyed and just basically lost in the experience was very stimulating to me, too, and even if it was JUST an act (though I believe it was not; I believe she was actually getting into a self-hypnotic positive state of sorts, really) it was still hot as hell. I popped my cork after about three songs, loved every second of it, felt very "intimate" with the girl, and she only asked me for the usual price of a 3-for-1 lap-dance at that club on that night. It's like, it was actually ENJOYABLE for her, in her own mind, to be able to GET ME OFF like that. It doesn't happen often, you have to know the gal and have some rapport, but it's not like they aren't human heterosexual (most of them) females (again, most of them) ya know ...