For me it is really a waste of time but if you have bigger audience just like the BTCGOSU and you really deliver good reviews, engagement, etc. I really think that is worth it if many people will sign up under your referral. I am not sure how much is the commission for each referral but I think the common is depend on the how much that the user did wagered on and I think some are depends it on the number of users they referred to their website.