Does this mean that any rank account is worth only $25? There may be some hackers who dont think that they may get more money through account trading. In addition, some account buyers may have spent more than $25 to purchase an account, and they will not be willing to hand over the account.
Although OP's idea is great, I think this may exceed the permissions of ordinary forum users, which is equivalent to creating a new "forum rule".
To solve this problem fundamentally, maybe 2fA will be a more reasonable way.