If you want to work with an affiliate, you need to know how you will promote the affiliate. It doesn't matter what is the affiliate site because it depends on how big they will pay you when you can get a new member to come and play in that site.
I don't work in any gambling site affiliate now, but I believe when you want to get the biggest payment from them, you need to promote in many places, and you can use social media to promote the site.

Some of us don't have any success to worked as an affiliate, but I believe that there is someone who can make a lot of money from the affiliate, but he doesn't want other people to know. The best you can do is only you need to try by yourself and see how much you can get in a month and then you can do a review by yourself.