Doubling and tripling the coupon value does cost the store. If you give them a 50 cent manufacturer's coupon, they get 50 cents back from the manufacturer plus a processing fee --8 cents you are saying. However, if they double that coupon, the store itself is out that second 50 cents. The manufacturer did not authorize the store to turn a 50 cent coupon into a $1 coupon, so of course, the manufacturer is not going to reimburse for that extra 50 cents.
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