My guess is that anyone who is ready willing or able to drop that kind of scratch on audio stuff isn't the sort who is combing these forum's looking for a bargain. Chances are, if you're in the market for a $40k amp, you're also looking for professional installation, delivery, room design, pampering, hand-holding, etc. -- not "bargain" used gear. Any way you slice it, the market for a $40k amp has got to be diminishingly small at nearly any "reasonable" price....