I'm kind of surprised that Groupon's business model isn't #1. It seemed to have the most influence and made most cash(again, this DOES depend on the market, but

I'm kind of surprised that Groupon's business model isn't #1. It seemed to have the most influence and made most cash(again, this DOES depend on the market, but still...I highly doubt the market's are that different as the revenues between these companies are).