I don't know if Groupon made a mistake, only time will tell, but this statement irked me a bit:
VC: “Founders make different decisions when money doesnt matter. He doesnt HAVE to sell, so he can wait. He can do what he thinks is right for the business. He can focus on his legacy.”
This can easily be the other way around: the founder chooses to focus on his legacy instead of what is right for the business.