"For the remainder of the year they had $669 million in revenue (simply staggering), but had a net loss attributable to Groupon of $398 million. This year, Q1 results showed revenue growth continuing to soar, with revenues of $644 million, but a net loss attributable to Groupon of $102 million."
So the time periods were different, but the revenues were the same. They went from losing $400mil to only losing $100mil... That sounds to me like they are getting close to being profitable again... And in a very short timeframe.
As for it being like a Ponzi scheme, it's not. Ponzi relied on lying to the investors and telling them the money came from good investments. It wasn't sustainable, and nothing could fix it. Groupon is sustainable and hasn't lied (that I know of) to their investors, new or old. It doesn't even need fixing as it looks like it's already on the fast-track to profit, based on the numbers provided.