The mega referral earnings players who shares their codes online are the one that have the ability to give their loyal followers those bonuses, and sometimes or even most times , the casino have nothing to do with this bonuses and the highest they can do for such individual is just to create that bonuse for in as affiliates and whatever rewards he chooses to give will come from his own pocket.

Sometimes, some of them give out money to those who registered under them to gamble with, and you know why?

Because the more the total wagers higher the take home pay at the end of the month as affiliates comissions.