I don't think you can earn much with affiliate unless you have a popular websites where people kept visiting, it needs a great article writing to persuade a user to register under your ref link. If you have a website like coinmarketcap, you may be able to make some registration under you with just a banner displayed on the pages.
Anyway, weren't there an affiliate networks like Peerfly offering BTC casinos too?
I try not to post my referral links anywhere. If a person is interested in that site that I advertise, then he will go in and register at a simple address. If he wants to thank me, he will ask for a referral link in a personal message.
I don't mean posting your referral link everywhere, its about cost per action (CPA) most of the time when advertising the site you have and that's where you create an article with your ref link. This is why affiliate marketing are mostly done by webmasters who owns bigger websites like Cointelegraph and the likes, they'd have higher success of selling something than just sending PM of referral links.