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is googleads looking for % click-througs or highest impressions to get the best revenue?
if you will have too big % then you will be accused of fraudulant cliks and forsake to Google-less hell.
But if you have high impressions that sounds better.
I personally prefer higher number of impressions. Also because it means that you have more readers... what excites me more than bucks from Googliness.
The per-click revenue you get is based on how much advertisers are paying per click, so the amount of competition in your site's field is the most important factor.
In my experience you can get around the fraud alerts if you explain your situation to them (as long as you are legit of course). Certain times/sites will have certian CTRS.