Both great questions.

On the project side, I hand approve every post. Spam/recruiter junk/etc. gets deleted and the email address blacklisted.

For the talent side, yes, you're right; there's a good potential for A++++++++ firm nonsense.

The quick and dirty approach is probably not accurately reflecting the work I've put in/will be putting in behind the scenes, through methods we've developed at Forrst for dealing with reputation, throttling one's ability to mass-contact project owners, anonymizing email on both sides with a one-click "this is spam" function, and so forth.

Ultimately, I agree -- they're great (and hard) problems to solve, and I'm eager to do so.