[deadmansshoes]

I think if a groupon is unused then the merchant is not paid, so Groupon keeps the $10. This is how kgbdeals works. However Groupon redeem expired vouchers (if asked) whereas kgbdeals refuse to redeem vouchers even if valid.

[jeremymcanally]

I don't think so (I don't know for sure). My logic says no, though.

Groupon always allows you to redeem an expired voucher for the purchased value (e.g., $10 for $20, you can always get your $10 in credit from the merchant). I think the merchant must be able to keep the purchased portion of it or they'd be out a lot of cash over time if their Groupon was a particularly popular one.