Groupon was too enthusiastic to become big rather than good. I understand why they thought it was necessary and to some degree I agree that it was the correct game to play but I think they have destroyed their chance of retaining the customers (businesses) they acquired during their growth.
Seriously they need to downsize quickly and fix their customer satisfaction (taking a smaller cut would be a start). It would be rough but at least they might turn a business loosing a $100 or so million every quater into a profitable business.
I have a feeling though what's in the hearts of Groupon's leadership is not the desire for a profitable business but a pump and dump.