Just to clarify.
Commission rates are different with different affiliate networks. I have seen some commission rates are low in cuelinks when compared to other networks like omgpm,vcommission,payoom,komli,dgm etc.,
You can grab coupons from desidime,coupon dunia etc., but the problem is some affiliate networks like vcommission, payoom doesn't pay for sales happened through different codes and they only pay for the sales that happen through coupons that are uploaded in their dashboard.
If you are in this business for a while, ecommerce startups will identify you and they'll start contacting you for promoting their coupons so that you can get exclusive coupons to your site.
hope this helps.