It looks like they have only adsense there but 99% of their visitors are kids.. so wtf?
because no one wants to click through to an advertisement when they sole purpose of coming to the website is to play a game.
Many place ads very close to the games on multiple sides for accidental clicks.
those flash game sites make fuck all i say.
i think the OP is talking about the big, social, facebook games like mafia wars and shit?
The problem is, you won't do nothing. Obviously you need to introduce at least 1 new feature for every few months, gaming sites that dont get updated at all will easily lose the competition to other sites. PLUS if you lose your SEO traffic or other source traffic, then you will only have direct traffic which obviously is not good for your gaming site. So it's still not worth it