He is going to cheat one of the signature deals which do not require posting and pays upfront. He makes profit in a month without doing anything. Don't sell him any account.
How can he even sign up to them when he can't post from them? Plus there aren't many deals that offer up-front payments anymore for exactly this reason as they're quickly exploited.
I got a buyer interested in buying this accounts. I really don't know what is their reason.
I can't imagine what they want or can use them for. You can't PM or post from them.