I understand your concern however this will not stop selling me my account.
250$ is few dollars for you?
Obviously, even I can't imagine to sell my unverified account, so I a person could sell his verified account which is verified with government issued id card.
If selling my own account will get me tagged then fine, but in that case go in -
https://bitcointalk.org/index.php?board=234.0Check how much account offers there are, for betting accounts, different wallets, exchanges and so on. Also they are selling in bulk which means its impossible for them to sell their own accounts. Would you tag them all in that case?
I can't prevent alone all forum corruption. I have remembered those accusation made on reputation most of that verified account sellers got tag by me. So if you are wondering there is any corruption, feel free to create accusation against them. So other DT members will be able to take a look on this either should tag or not.