The Groupon Paradox - Esther Dyson`

http://www.slate.com/id/2289087/

Thanks to Groupon, merchants may face a similar, but perhaps even more damaging, fate. Prices are likely to erode as consumers come to expect deals. They will wait for sales to buy, and merchants will find themselves competing ever more fiercely. Meanwhile, merchants' brand power will be eroded as consumers look to Groupon (as they do to Orbitz), rather than to the merchants themselves, for the best deals.
The logic is simple: Merchants are encouraged to use the deals to attract new customers, who in theory will return at full price. But, in what seems to be an increasing number of cases, customers come for the deals and then leave for deals offered by other merchants through Groupon. So the number of "new" customers attracted by cheap prices increases, and the number of loyal customers decreases as shoppers prefer to become "new" again for whomever offers the best deal.