For that amount of impressions, I think your clicks are really low. It comes out to around 0.55% CTR. How well is your ad blending?
I would think you would be making more clicks and $760 seems low for 6,600. You should look into changes of ad placement and blending to try and boost your clicks. Are your ads targeted well for your site content?
The ad blending is fine I believe 728x90 ads on the top and bottom of each page on the site with no borders and matching the color scheme of the site. Yes I have a very active forum and yes the ads are targeted well to the site content.
Your CTR's quite low but EPC's not bad. I'd 600,000+ impressions, 17,000+ clicks and earned $1,600+ in December for a network of websites across multiple categories.
So it's around $0.115/click,not bad to me. But the CTR is a bit low,you should try the other placements,formats,colors.
He said it was a gaming site, well, we all know they don't pay much in terms of cost per click. Thats a lot of impressions for sure. Have you looked into CPM based advertising?