GoDaddy forbids account deletion
Now, I loathe GoDaddy - for their elephant-hunting CEO, sexist homepage, and most of all because I had to use their awful admin interface for work - but expecting a company with whom you have a commercial relationship to delete their records of you seems unrealistic.
Sure, you can mark the account as dormant and remove the authentication credentials, but at some point it's a matter of historical fact. Governments tend to prefer that companies keep accounting records, and look unfavourably on those that don't.
So does other popular domain registrars. Eg:
Namecheap: http://www.namecheap.com/legal/general/privacy-policy.aspx Scroll to "Personal Information Following Termination of Account"
I think it has something to do with the ICANN rules.
This seems like a more public representation of what is probably being done on most sites anyway, with the exception of the login credentials being invalidated. That being said, it is more than a little unnerving to know that my account will always be accessible in one form or another. As a member of the "internet" I felt that there were certain understood "rights" that were available to me... account suicide being one of them. I guess that type of thinking is more hopeful than realistic nowadays.