I think they're all getting pretty much what they want.
Courtney is getting to be the two-faced evil skank ho that can completely control Ben. She'll make some cash out of it by just having the face of evil and maybe it'll even score her some more modelling work and a part in some some D-list reality show down the road. It's just sex for money, it's not like she's a prostitute or anything.
Ben gets to make out with a bunch of women and maybe even boink one or two here and there. Frankly, that's all I think he really wants anyhow. Free sex that someone else (the producers) are paying for.
The other girls, well, I'm not sure that any of them are really smart enough to know any better anyway. They can kitty cat fight and cry and one of them will be next time's bachelorette. It isn't much more than a tryout for that show, really. (Mo money).
That was cynical, but I'm not really sorry. :p