I wrote a little about this:

Another way to respond to this critique: Groupon could have theoretically solved this problem by adopting faster payment plans for merchants. That would make theirs a worse business with lower cash flow, but it would help their PR (and perhaps their valuation). It’s counterintuitive that Groupon could make their business worse but make their valuation better—it depends on whether their share price is, at the margin, determined by the skeptics or the believers.

( http://www.digital-dd.com/hp-immaterial-usability-users/ )