I used to run an affiliate program for a company and one of the top affiliates who was making a large sum annually from the program before I took over got quite hostile when I pointed out the bulk of their referrals were from coupon sites. They started trying to intimidate us about the backlash that would ensue if we took action and even brought a very physically intimidating person into a meeting for no other apparent purpose other than to be intimidating.

The data was very cut and dry and in blocking coupon sites in our terms as one of the first actions I took in taking it over they lost a very high double digit % of their revenue from the program overnight.

Surprise surprise, overall trials and subscription rates didn't change and channel ROI improved significantly. Goodbye Felicia.