To put it simply, Groupon provides a service which is essentially customer acquisition. In order to report a profit, they use unconventional methods of accounting that imply costs of their own customer acquisition are irrelevant to their profitability. It's not esoteric or one-off costs they're eliminating from their "profit" figure.
Given that Groupon have attracted attention more for their claims of profitability than any particular novelty or technical superiority it's more than a little concerning that using conventional accounting methods they're making a loss, and it's ongoing marketing expenses rather than one-off acquisitions and compensation schemes that are to blame.
Given that Groupon have attracted attention more for their claims of profitability than any particular novelty or technical superiority it's more than a little concerning that using conventional accounting methods they're making a loss, and it's ongoing marketing expenses rather than one-off acquisitions and compensation schemes that are to blame.