If you are interested in Groupon's actual performance rather than a reporter's linkbait, see the filing. I find the table on page 57 rather informative about the current state of the business. http://sec.gov/Archives/edgar/data/1490281/00010474691100717...
That means even if they cut their marketing budget down to 0% they're still only looking at 10% profit BEFORE taxes. I really don't see how their business is going to be profitable in the short or long run, given the losses they've run up getting to this point.
Does anybody think these things are not really about the fundamental business at all but rather just a very impressive performance designed to make a few people rich from IPO/mergers?