Earlier quoted context omitted.
It's gross revenue rather than net. Take 50% off the top for paying merchants. Then the expenses you mentioned (sales cost, software design, hosting, etc.). My guess though is that their major cost is customer acquisition. That seems to be the norm in this space. They're buying customers for $5 and making $2.50 off them (numbers theoretical, as an example) hoping to make the rest back later when they've won the marke…
They can't claim the merchants' money as gross revenue, if they are using GAAP. It's the same issue that Groupon ran into and got slapped for.
Living Social is private and can do whatever they want, but they probably are using net if they're comparing themselves to Groupon. Otherwise they're making themselves look half the size when they are really a quarter, which I suppose could be purposeful.