10% discrempency is actually pretty good, I typically get 15-25%. Hell on adsense I get up to 40% difference from Google's reports compared to mine.
While it does suck to see the differences, there's not much you can do about it. The way I look at it, is compare how much revenue you get from them based on how many hits your system logs. Figure the revenue per click. Then go with whichever sponsor gives your the highest rate. I don't bother looking at what their hit count is at this point.
WG
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I play with Google.
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