I'm not a merchant, and I've never used a Groupon deal as a consumer. I say that to show how disconnected I am from Groupon. And yet, I hear that merchants ofte

I'm not a merchant, and I've never used a Groupon deal as a consumer. I say that to show how disconnected I am from Groupon. And yet, I hear that merchants often have trouble collecting whatever they're supposed to get from Groupon; they're sort of the PayPal of deals. That rep must not be good for sales.