Rules also state that account sales are discouraged - which implies that there is a potential consequence.
No one is asking for encouragement. Just leave sellers alone.
: prevent or try to prevent (something) by showing disapproval or creating difficulties.
Create difficulties for these scammers, which are quite a lot here.
If the seller cheated, then such a seller should be punished.
But punishment can not be just because I'm a salesman.
Is it logical?
If you sell someone a gun - in a lot of countries you will be charged as an accessory to the crime that is committed with the gun.
If you sell an account and get caught - then you ignored the "discouraged" part of the rule.