Adsense Revenue Sharing Sites - Which is the best? What's your experience

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I only recently came across the idea of google adsense revenue sharing sites and wondered whether there was anyone here who had partaken in any of the sites. If so which ones did you use? How much did you earn? Do google adsense accept that particular site? I'd be keen to know, I'm thinking of signing up to one but don't want it to effect my day to day adsense earnings by ending in a cancelled account.