Based upon my prior posts about IPOs, the reduced valuation comes as no surprise to me, for a few reasons. First, the stock market has been volatile lately, which typically has a negative impact on valuations. Second, Groupon has had a couple well-publicized problems with the SEC - the restatement of revenue, the controversy over its unique accounting metric, and the leaked employee memo - which have generated negative press. Third, the company's business model has also been under scrutiny.
It will be interesting to watch how the IPO does...