I would suggest that you stop selling bitcointalk accounts.
Mostly scammers buy accounts to scam people with the registered date.
I don't see any benefit in buying accounts if your honest/trustworthy.
This only benefits the scammers.
It is a lie, Quickseller already said that rarely bought accounts are used to scam, and when they do, they manage do scam less than what the account is worth, making it worthless.
BTW, how much for each newbie from 2011?