One of the little things in life that irritates me are the marketing efforts of retailers who provide coupons and or club cards. The reason being is that if I come without those items they charge me one price, but if I come with them they charge me another.
I know that even with the coupons they are still making money, if they were not they wouldn't make such offers. So what this really says to me is that they will try and gouge me for more as often as possible.
I'd feel better if there was one set price.