Click Bank sucks!! I think they keep the commissions. Why else would they not offer better tracking. I ran a test and had 5 people buy the same product on the same day from me. All family from different states. Five different credit cards from 5 different states and all receipts emailed to me. I got credit for one sale When I called to complain and told them I had the receipts for proof of the sale, they claimed the other 4 were returned after a few minutes of ordering or declined.
I would stay away from Click Bank and use Azoogle Ads, CPA Empire, Commission Junction or any of the others that are a little more legit and offer something other than ebooks.
Matt