IIRC one of the US grocers (stop and shop or Kroger?) actually tried that as an ad for their store card: "you do not even know how much you will pay for many pr

IIRC one of the US grocers (stop and shop or Kroger?) actually tried that as an ad for their store card: "you do not even know how much you will pay for many products, but it will be a lower price". Needless to say this didn't run for a long time.