I agree with allfetish. Although sponsors have brushed off saturation in the past, it can be very real. If 100's of webmasters are pushing the same site, there's a good chance your surfer might have already seen or even bought from the site. It only makes sense.
And for sure as Viper said, check out your sponsor hits, just do month totals see if they did increase with traffic increase. Least narrow it down.
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