All of the dating websites are meat markets. Some say they do a better job or appeal to a better demographic, but that's just a disingenuous marketing angle.
I think these websites are perfect material for a best-selling book. You could have chapters on the different kinds of profiles, the various damaged psyches and the lies they tell, which ones send messages/ winks/ etc, which ones respond/ don't respond to messages... the possibilities are endless.
But maybe I'm just cynical...