Is it even established that companies lose money on Groupon customers? I usually spend over the face value on a Groupon, so the restaurant gets (bill - (value o

Is it even established that companies lose money on Groupon customers? I usually spend over the face value on a Groupon, so the restaurant gets (bill - (value of groupon/2)). If the profit on a dinner for two is more than half the value of the groupon, which seems plausible, they're not losing money. Then there are the people who never redeem their groupons. I'm about to move to another and leave two groupons that I never got around to using unredeemed.