This guy doesn't deal in those books. He deals in books with known prices and enough volume that he can be reasonably sure it'll sell in a moderate amount of t

This guy doesn't deal in those books. He deals in books with known prices and enough volume that he can be reasonably sure it'll sell in a moderate amount of time. If nobody else has it on amazon, this guy isn't buying it and putting it up there. Your stated benefit doesn't exist.