The most interesting part of this post is the guy who wanted to build a service that reviews you online dating profile. That seems like something that has real potential.
In my experience, one of the most frustrating things about being on an online dating site is that it's really hard to get feedback from women about how your profile is perceived by them.
You send messages to a bunch of women and 90%+ never respond, but you have no idea why. I would pay $$$ to find out why they don't respond, and I'm sure that a lot of other people would as well (especially men).
Could this be built into a site like OKCupid? Perhaps some kind of revenue sharing arrangement (between reviewers and the dating site) where users pay to get feedback, and other users get paid to review the profiles of men or women who message them(or maybe even those who don't)...and it's anonymous feedback...or semi-anonymous.