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I think this goes back to the more general principle that discounts can only save you money on things you were going to buy anyway. If you were going to be at Arby's anyway (or some such similar place for food) then the coupon saves you money, if not then it doesn't as you pointed out.
Another example of this is bulk purchases. My local grocer sells raw carrots in a one pound bag for 1.99 and a five pound bag for 2.99. Buying the bulk bag doesn't save you any money until you use more than one pound of carrots before they go bad.
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The advantage law is the best law in rugby, because it lets you ignore all the others for the good of the game.
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