The idea behind Groupon (spending marketing dollars on customers instead of media) is changing the face of commerce worldwide. No matter what Groupon does, tha

The idea behind Groupon (spending marketing dollars on customers instead of media) is changing the face of commerce worldwide. No matter what Groupon does, that cat is out of the bag. It's up to them to make sure they capture as much of that value as possible. That takes a lot of money but if they succeed, it will be worth it. The chances are not small that Groupon will be a $100B business in a few years.