Indeed, it appears that we're both correct, assuming you're not in the US. Interesting article from 2012 sheds some light:

Some context about how the company operates: Groupon has had two very different payment structures. In what I call the American model, merchants receive cash upfront for a deal. Once the deal is closed, Groupon tallies up how much it owes the merchant and sends them the money in installments, with the vast majority of the money delivered within 60 days. If a Groupon isn’t redeemed, the merchant gets to keep the money. (Known in the industry as “breakage.”)

Outside the U.S. and Canada, Groupon has used a different scheme. For simplicity, I will call that the European model. In this scheme, Groupon only pays merchants when a Groupon is redeemed; merchants do not get cash up front. If a Groupon isn’t redeemed, Groupon gets to keep the money. Breakage is considered to be 20-25% of Groupon purchases, so this amount is significant.

There are exceptions to the above. I know of one popular merchant in Europe that negotiated to get the American model. But this is largely how it works.

http://venturebeat.com/2012/08/15/the-giant-red-flag-that-an...