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Nothing on the order you are describing though. I would back up, double check your logging software and make sure it is coming in right. Then double check what Overture is listing for clicks and ask your acc rep for a hand check if you still think there is something wrong.
Most of the time the difference is due to drop-off before people hit the site. However, it could also depend on what your logs are tracking. If you are tracking by unique IP address, keep in mind that millions of AOL users share the same small number of IP addresses so 20 clicks may only register in your logs as one unique IP address.
Going back a little while I was doing it for the odd one here and there. Now, because success is measured by ROI, these things are factored into the overall results.
Ultimately, if the PPC's are getting significant wasteage then it will show in advertisers signing up or not and staying with them or not.
I don't think any of the bigger PPC's can be in the position of being that arrogant that they wouldn't care (I don't think the partners would allow them), and none of them seem to be.
If the discrepancy you have isn't very expensive, I would not get Overture involved and instead investigate your logs vs. Overture reporting to see if there is a common theme among what isn't tracking.