first person shooters, MMORPG games would ask for a site like this. general gaming forum, etc. there are a ton of forums out there catering to the player community, thus your challenge is to offer something that the other site/forums don't have.
as a stand alone domain: low $xx due to the fact that the name alone doesn't tell me anything about the content other than its gaming related, which is a good start, just not enough to yield a higher number just yet.