Don't forget to type in the regular url and see what the default billing choice is. If it isn't the same one that you are sending traffic to there is a good chance that the cookie which gets set is pretty much worthless. You'll often only get credit if they buy immediately after they click your link in that case.
Example:
1. You send the surfer to the site using a ccbill refer link.
2. They don't buy but they bookmark the page.
3. One hour later they use the bookmark and come back to the page.
4. The default billing option is Zombaio from the bookmark. So it never sees your CCbill cookie. No credit for you. Sponsor takes 100% of the sale. You get nothing.
It's getting more popular for programs to use many different billing systems and this could be another reasons why you are seeing your conversion rates get worse.
Note that the above is not true in all cases. It's possible to put in a system which handles this but from my experience few programs bother. Obviously something like NATS would be a different case if properly configured.
What % of surfers would you estimate do not buy immediately? Perhaps somewhere between 10% - 30% ? That could be a lot of money.
