I don't get it - how is Groupon supposed to scale? What would be the point of them having 100000 small businesses in a city? They could hardly put them all on their homepage? Also, they would need enough visitors to their homepage to drive business to all their clients.
What does Groupon offer, besides traffic (ie people who visit the Groupon homepage)? Can't small businesses just make up their own special offers? I mean if they are not on the front page of Groupon, they would gain little by going through Groupon, or so it seems to me.