I’d be careful with the popup idea, because of all the popup blockers out there…. That being said, I believe there is a way to make a popup that is immune to the blockers — but I don’t know how it’s done, or if it is even possible in reality.
I like the idea of asking your visitors to register. Perhaps you could start collecting email addresses for a “free membership” to your site.
Become a member and enjoy the following benefits:
– If you encounter any problems with our approved casinos, we’ll go to bat for you!
– Receive special bonuses available to members only!
– Receive a free monthly newsletter!
– etc., etc.
You could use cookies or php “sessions” to track your visitors when they are on your site. You could track the pages they view and you could track every single link they click on. It would take a while to set this up, but it’s possible.
In the end, however, I don’t know if any of that would be helpful in tracking what your players do once they reach a casino. To test the affiliate stats tracking, perhaps you could select people from your membership list and give them $50 free to try out a new casino. Give them instructions on how to clear cookies, cache, and such beforehand.