I'm a big fan of groupon, but this situation is going to repeat itself, I'm sure.
Recent example:
http://www.groupon.jp/deal-detail/cid/4054
For those who don't read Japanese, that's a mom&pop-like Thai place doing a 500-yen ($6) all-you-can-eat coupon.
They sold 3500 coupons.
I just can't fathom the economics behind that one.