Seems like each of us thinks the other's a bit 'slow'. So I'll continue in the same vein. Once we've made a booking and showed up, none of you prostitutes know who any of us are anyway. Unless we decide to tell you. So how is the object of our desire in this instance, going to know if someone wants a good time or is just trying to be a hero?
She opens the door to him and he looks a little anxious, a little underwhelmed, perhaps even a little brisk with her. She welcomes him in and offers him a drink and he says, no abruptly because all he is interested in is getting in and away again. She offers him use of the bathroom and again he says no, because he couldn't give a toss if he is a bit sweaty or smelly as he has no real interest in her and just wants to get it over and done with.
He passes over the money with a look of disgust on his face that tells her that he would never normally do this in a month of Sundays and maybe even holds on to it for that second longer as he wrestles with his gut reaction to walk and keep the money.
He has no interest in kissing her, he really doesn't want to look her in the eyes at all, but instead ushers her towards his limp cock and pushes it into her mouth in the hope that if he closes his eyes he might be able to get hard. At the same time, he doesn't really want her to be very good, as he actually wants to go back to the guys to tell them how shit she was.
When finally her work has achieved the goal, he then opts to go doggy, not once having touched her in a way that might stimulate her or make her feel that she is included in this experience and he fucks her from behind, cums quickly and leaves 20 minutes early so he can say that she did not offer him a refund.
Perhaps a scenario like that might make her perceptive enough to know that he was not really interested in her. I was talking generally, that no woman would want to entertain a man who was there against his better judgment. If he does not desire the woman, she will know and she will react accordingly. The hour or half hour knowing you lot, will feel like the longest half hour of her life and I think it is a silly idea. However, if you were doing it as Fannytastico suggested and you did like the girl, but just wasn't sure if she was the real deal, then it might be a good idea.
Your ideas are distasteful when they are routed at being nasty about another person, taking the piss and then laughing about it afterward on the forum. It's a childish prank and some of you need to grow up.