[chc]

You could raise similar doubts about most affiliate links that aren't precisely equivalent to a banner ad. For example, a blog with a review that uses affiliate links for monetization? Well, I usually look for reviews when I'm thinking of buying a product anyway.

At any rate, the heavy coupon shoppers I know tend to be more malleable than average based on what deals they find, so I doubt this is a low-quality referral source.