Wow, now there's a loaded question. Why don't you just ask us whether we're gonna stop beating our wives?

The reasons to be skeptical of Groupon are well documented. Not that it's a bad business, by any means, it's just that it's an industry with low barriers to entry and many competitors, and Groupon's early success is unsustainable since it was built on persuading businesses to offer ridiculously good deals which are likely to lose them money; businesses are wising up to this, deals are getting worse, people are getting less interested, and in general the whole social-coupon industry seems to be settling into a new equilibrium in which a $10^10 valuation for Groupon seems excessive.