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.
Of course it does matter, would you work on any sites without doing researches about how their affiliate program works? Or at least about the reputation of the site? Look at the a site that offers 75% of your referral deposit (coinslotmedia), it is a big amount of commission. Would you like to work on such affiliate which is so too good to be true? I guess yes, because you only relies on the amount the site will pay but not for the reliability of the site.