For freebitco.in, the only thing people want to play there and try to get their affiliates is because it is still the best faucet ever until this day. And there is so much benefits that they offer like lottery and competition all the time and that is the only reason that I can think about their affiliates program. Despite their 5% house edge, there is so many things that they give out to players for their benefits as well
Yeah, that is their shtick to be honest with you, the house edge is amazingly high compared to any other place but they give out sooooo much thing that in the end it becomes like "you don't think you can win other casinos? Well here you will certainly not win but there is a small chance you gonna win a HUGE amount all of a sudden".
I mean on %1 house edge places you lose anyway, not like you win in any other casino, so here with %5 house edge you will DEFINITELY not win but from free faucet to rewards to lottery there is a chance you hit it really HUGE once and that is all you care, no matter how much you spend there is always a chance you get to win big. Other places do not offer that, they offer better house edge but you end up losing anyway, here you lose but at least gives you a big win chance.