[zenith]

The way the referral system works is your referrals need to reach certain milestones in the game to generate referral points. Once they reach these milestones, you get the points automatically. You can then convert these points to credits.

As long as the referred player is active, you will continue to earn referral points. So one very active player can be worth more than 1000 inactive players. There are already 3 players who have generated over 1000 credits for their referrer in less than a month!