the only serious thing that someone can handle with this problem is to build a commercial website like anyother freelancer website, where contracts are given with a lot of security , but the content is not a single way related to the main project itself...

vb.org have no way to control the members here, because it's an open community. each time someone steal a member, all the community suffer... imagine if a coder think he can make trouble by complaining about the rating he receive... flaming will be all around...

external and controled environment is the best... there is already some freelancers websites that offer project calls for vBulletin boards... they are supported by the security system, and payement systems like Escrow....

btw, we already tryed the rating discussion... last winter we had to "ban" someone, and we had a load of discussions, and abandonned a lot of ideas... and btw, the person stopped his activities, and hide now...