playing devils advocate, they could say that not everyone uses airline miles,The letter is quite sneaky in that it refers to increasing earned rate when the “effective” earn rate is really dropping. If they were honest, they would have just said we have reduced the earn rate for Supermarkets from 3:1 to 1.5:1 and left the redemption rate alone.
so that they arent devaluing anything if you are going to use your points in other ways