No one can say how much is 1 click worth. It generally depends. Well.. games sites have usually low CTR that's why I think they won't make big $ in sufficient amount of clicks.
DON'T GO INTO THE GAMES NICHE ! I made a gaming directory for shits and giggles. I haven't put that much time into it, but you get paid 4-6 cents per click. And copying websites like miniclips, gamesloth, addictinggames, armorgames, shockwave, gungamezone, and the other thousand similar sites is going to be hard to get ranked very high regardless of SEO.
Wouldn't bother with the game niche, very poor CTR and clicks are generally under 10cents. The entertainment niche is taking its toll these days.
there are some CPM advertising network for flash games sites i think its better than google in this regard
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