That is quite different from blogs. A) readers are not employees B) blogs are trying to help readers with the best information. If they are not providing the best offers, the reader does not know whether it is because he is doing it to make himself money or because he does not know about the better offer. The good blogger (and one that will retain loyalty long-term) is the one that allows such a comment and even mentions the better offer, even if he/she still offers up their own referral offer as well.