Perhaps I am just paranoid. But no way I would ever do something like that. I would sell to a reseller or consign. Ever since I got ripped off as an 18 year old buying a used car, where the battery was charged to cover up it had no alternate, or fly wheel and could only operate for a few hours. The guys were at the bank cashing the check immediately.
I also know guys that buy and sell $10K audio stuff. They seem really lucky to me.