Why would you want to access the donator forum when it's completely dead? And you'd be easier just trying to become a mod to get access to it.
This gave me an early morning laugh

Why on earth will a donator sell his account after he donated plenty of bitcoins to get that status?
Just doesn't make sense.
Maybe to recoup some money? Donator status isn't worth much at all really and obviously isn't worth what they ended up paying for the account in today's fiat value.