Ive been wondering how the AD prices are as well. i know a lot of references lose some value almost immediately - at least over retail - so I haven't really given much thought or serious consideration to an AD.
There were a few threads on TRF discussing it in length. Honestly if I were in the Gen PAM market I would buy from an AD if I could secure that 30% off, otherwise buy secondhand in almost new condition for a decent discount as well. But the 2 year warranty will likely have expired if even still applicable with the secondhand option.