Probably related to Bob Parsons killing that Elephant . I would say they are probably at their saturation mark but seeing how the internet is still growing I don't see the need to sell...imagine how many more domains will exist in just ten years. That's a crazy amount of domain fees.
I wonder what why was Godaddy was put into an auction. I am just hoping that the new owner will lower it's prices so that more customers will be attracted to use their products again. How sad for go daddy!