I only play on Stake and FuturoBet - I know that both have affiliate programs but I don't really use any of them. Maybe because I mostly play for fun and I don't find a need to engage more people in this. But I believe there are many people for whom this idea should work really nicely
Sometime last year, i got some reasonable amount of dollars from affiliate program from one of the most respected gambling site on the forum because of my referral. I got this guy from FB and gave the link out but was surprise to see that he was a gambler and he invested much on the site and i equally get my reward from the affiliate too. my affiliate links are always be shared on my FB group page.