I'm not sure weather this feature exist already on your site, it it does please disregard my post because it is just ignorant...
Anyway it seems you lose alot of good quality cappers that have real money on games due to a couple people that come in and bash them for now reason... I know it should be easy to just ignore them, but when you just lost a grand the last thing you want to here is I told you so from some little pissant that knows nothing..
So my proposal, is to offer customized chatrooms, I worked for a few websites in the past, so I know the programming involved in this is rather elementry. This way you can have private chat, with those that you want to here from... Its my assumption that in these rooms some real capping will occur... It should also attract back some of the more knowledable cappers because they would no longer need to listen to the idiots..
Just my two cents, I really do think it would benefit your site tremendously though.