It is depend to the buyer but selling account is not allowed. Anyway, level 2 account can make it easily, so the price will be around $10~$20
Its worth nothing, because its not your account to sale. That would be like borrowing a car from your friend, and then selling it. If you do sell an account that does not belong to you, that might be considered wire fraud - and its a federal offense. Do a google search for wire fraud and see what it has to say. Before you sale something, you better make sure you have permission to sale it.