[Thor]

What I would love to see is some kind of roll down for the referrers. Let me explain myself better...

X refers Y and gets 200 credits everytime he donates 20$
Y refers Z and gets 200 credits everytime he donates 20$ and then X also gets (example) 50 or 100 credits for Z's donation. This could go down 3-5 levels. After all ,the referrer of your referrer is alos responsible for you coming to the game.

But maybe then it would give too much credits but the original referrer of many people would get the bonus for all those that really came to the site thanks to him in the end.