[donald123]

This is bold and terrible idea. Affiliate programs encourage members to bring users, no matter through coupons or blog posts or other legit means. They have no idea if a user is coming because of a coupon or other reasons, how can they exclude this type of sites?

Besides, even if like you said a user is ready to buy something, there could be better coupons from rival retailers which bring the user to the site and look for the same product. Isn't this what a lot of retailers want? Using better coupons to bring users from competitors site?

There are many other scenarios, without considering those and just make the decision is really bad.