I used to shop at Kroger all the time, but then they implemented the rip-off spy on customer cards and now they get my 'Need a gallon of milk or a loaf of bread" business only, and not very often for that.
Their prices shot through the roof, and unless you show that card, they will happily screw you standing for the things they sell.
I know others that feel that way about that card but it really doesn't bother me.
I have no problem using the card. It saves me money on groceries and gas.