Who cares? I say do as you please as long as you are not scamming anyone.
Scamming is the problem. Selling account is not. Make it clear that an account is bought and do not tag negative to the bought account. This will be a good business for the forum.
I agree with your opinion,
according to
https://bitcointalk.org/index.php?topic=703657.0#post_faq although it is not an official rules issued by bitcointalk, but can be used as a reference.