Do gambling affiliate is good while you gamble but I think it still need some diligence to get people join your referral, but it's worth a try if you know you can get some.
When you are a gambler and you are an affiliate at the same time, it'll be more easy for you to gain referrals since you have the experience in gambling and you know what you are doing, this would help you much if you are really willing to spend time to promote any site, and actually you can promote a lot of site so more chances of having referral income as your referrals are increasing.
You can some twist with your referrals, providing some good tips and how to manage fund while playing can attract people to use your affiliate.
There are different types of style in order to bring people to the sites that you are promoting, whenever they deposit money you'll gained benefits
very good way for passive income, it's take time but really doable if you are willing to take part.