Believe it or not, discounts are a crazily important part of shopping. Say you buy a gallon of milk; (which can be more than a gallon of gas) you need a discount every once and a while to keep buying that milk brand. And the only reason you buy a lot of things is because you get a "good deal" on it. I know my mom buys 2 tubs of vanilla ice cream because it is something like four dollars and fifty cents for the two of them.