Thought this deserved a little bump since my buddy just used my method to save his account before he got scammed while trading accounts.
Heres my original post.
How many of you have sold you wow accounts only to have the paypal payment held/recalled, and left you with nothing? Well I found out a way to render your account unplayable ( safe from selling / trading / deleting ) until you phone blizzard and get your account back. Simply log into account management, set up the parental controls to an email you have access to, set up the password. Leave your account management window open during the transaction and if it goes sour, click the parental controls and make the account unplayable all hours of the day. Your scammer will be left with an unplayable account, making you account safe from trading /selling / deletion, giving you time to contact blizzard.
NOTE: Even though you gave them the account info, changed the email on the account, or if they changed the password, you will not be logged out of account management so don't close the window, you can have it open as long as you want after the transaction in case it goes sour.
edit: only to trades during the day time, before blizzard technical support offices close for the night, so you can phone them and retrieve your account asap after it is locked via parental controls.