Buyer Beware: Your Microsoft Keyworld posts leads to illegal usage of said keys. I read topics detailing that Keyworld resells volume licenses of software and operating systems through their site. Which threatens previous buyers with potentially revoking their licenses.
I went to a garage sell last saturday, and the lady had a PS2 for sale, but she had a sign on it that said "Nintendo -$50", had to laugh, almost bought but she didn't know if worked, and she didn't have controller or cables, so I passed.