I don't think accounts should be bought or sold.
I believe that for project continuity, joint accounts should be allowed, and accounts could be transferred within an organisation. In both cases, the status and use should be declared publicly.
I agree that accounts shouldn't be bought or sold, but how to prevent that from happening ?
I must remind that, DT resort to leave neg feedbacks for account traders because such events aren't (and probably won't be) monitored by the staff in the near future.
Same goes with scams ; they aren't moderated.
It this were to be established (banning for account trade), I believe this opens the door for numerous different attacks towards staff.
As I understand it, accounts trades are frowned upon but not explicitly forbidden because it would be nearly impossible to enforce whatever consequences efficiently.