The filing of the Groupon S1 has resulted in a lot of discussion about Groupon’s business model. Most of the comments were negative, going as far as calling Groupon a “Ponzi Scheme,” although there were a few defenders, such as Steve Cheney. I was particularly intrigued by a thorough analysis by Yipit that shows that Groupon’s economics appear to be deteriorating in a more mature market such as Boston. If that is indeed the case, then it supports my previous contention that Groupon does not r...