I respect that Groupon has more resources available for businesses than Digg had for publishers. I still don't hear many stories about businesses BUILDING THEI

I respect that Groupon has more resources available for businesses than Digg had for publishers. I still don't hear many stories about businesses BUILDING THEIR BUSINESS through Groupon. I respect the heck out of what they've done, but don't see how it can last 4-5, 10 years once the fad wears thin. Feels like tulips, not railroads.