I'd like to add my first hand experience with Overstock.com. I ordered from Overstock.com before, thus, it sends me ad emails almost everyday. I do not want to receive these emails and I click on unsubscribe. But, it continues to send me emails almost everyday. I have to set up gmail filters to automatically delete emails from overstock.com. Obviously, I was annoyed by the practice.
Retailing is hard enough, online retailing is harder. Online shoppers can compare prices so easily, just by make several clicks. Although I admire Prem and Chou, I personally will not invest in Overstock.
Disclaimer: I have no position in overstock (long or short).