"With one qualifier, presuming that the hub and wheel flange are flat and in good condition and that the wheel bolts or hat mounting hardware is in good condition, installed correctly and tightened uniformly and in the correct order to the recommended torque specification, in more than 40 years of professional racing, including the Shelby/Ford GT 40s – one of the most intense brake development program in history - I have never seen a warped brake disc."
So in other words if wheel nuts are not torqued to the right spec and are not uniform, you can in fact have a warped disc. Improperly torquing wheels is fairly common, so why would a warped rotor be so uncommon? Also when machining rotors, taking a light cut, often the bit will only cut a portion of the rotor (the part that sits higher than the rest), and it will show material taken off at opposite ends of the rotor, on opposite sides, if that makes any sense(and the rotor can be dismounted, rotated 180 degrees, remounted, and material comes off the same spots, so it can be confirmed its not a problem in the mounting of the rotor to the machine). I dont see how uneven pad transfer would cause that, if it was uneven pad transfer wouldn't i see random sections of the rotor being shaved off because of random high spots caused by pad transfer?