No one is claiming that Groupon isn't a real business. They've made a household name and their reach is undeniable. Many of us have paid out of our pockets to buy from Groupon. I know I have.
No one is saying that investing isn't dangerous. The market has always worked this way and Groupon is no exception.
Recognizing & reporting revenue for software and virtual goods is a -solved problem-. Take a look at EA's earnings report or Zynga's IPO filing if you want to understand how the big boys do it. The accounting required is certainly tricky, but it's also widely accepted and tied to reality. While Zynga's profitabilty in the future is uncertain, their profitabilty right now is NOT.
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There are two core issues with the Groupon filing:
* Their use of ASCOI grossly misrepresented their profitability -right now-. They may have an innovative business, but the way they handle money isn't that different. Certainly not different enough for them to invent new ways to report earnings. Thankfully, the SEC agrees with me here and has asked Groupon to redo some of their funny math.
* Their last round of financing almost ENTIRELY went to cashing out previous investors. That has nothing to do with "taxes being hard". It has everything to do with sketchy business practices.
In conclusion - Groupon's filing isn't scary because IPO's are hard. Groupon's filing is scary because they were a little TOO creative with their math and they've done some undesirable things with their cash in the last 6 months.