I agree that the valuation may be high, but their filing is no more problematic to me, than zynga's. Zynga failed to detail just how much of their revenue is coming from 1% of players who actually pay. They merely alluded to it as a risk factor, but I think is is a pretty important piece of information as a potential investor. I found filing Groupon's to be adequate. One bonus to a made up accounting metric is the SEC requires a GAAP reconciliation to be included, so you tend to get more details about the business than if the whole thing used GAAP numbers.