What can Account for Discrepancy in Popup Traffic Stats?
 

Bought some popups and sent to sponsor. The problem is that the sponsor stats show only about 7% of the popups I bought. Example: I bought 10,000 and paid for 10,000 at a certain rate and sponsors stats show only 700. Major WTF :(

What might be the problem?

no one clicked through to that annoying shit.

Actually you're right :) Sponsor was only counting clickthrus from the pop to their tour and popseller was counting all pops. So I was comparing apples and oranges.

Sponsor only counts 2nd page clicks?

That is a common thing...

My ratio is 20,000 pop-ups to 2500 unique click troughs.