Simply stating it is not a ponzi scheme doesn't advance the conversation in a meaningful way in my opinion.
It's really just semantics at this point. There is a lot of evidence here that suggests systematic misleading (if not out-right defrauding) of investors. So you while you are technically correct, I think what Groupon has done is in the spirit of Ponzi even if it is executed differently. What's happened here is more than just a bad business plan executed honestly producing poor results. Just because we don't have the exact word for it doesn't make it any more ethical.
It's really just semantics at this point. There is a lot of evidence here that suggests systematic misleading (if not out-right defrauding) of investors. So you while you are technically correct, I think what Groupon has done is in the spirit of Ponzi even if it is executed differently. What's happened here is more than just a bad business plan executed honestly producing poor results. Just because we don't have the exact word for it doesn't make it any more ethical.