Why the difference in resale value?

@mike_in_nc I have the 535L. I cannot be sure if it's Pass designed or not. I love the bass and the slam but the treble is a bit rough. Same experience. Bought in early 90s.

Probably just supply. Why would anyone actually care?

Hey out there.  I do appreciate all the perspectives coming from everyone.  It was fun - for a relative 'snoozer'!  Maybe I can spice things up a little.  So, "Fuzztone," you wonder why should I care in the first place.  Well, maybe because I would be looking to differentiate among historically well regarded yet affordable products of the same class currently on offer in the resale marketplace.  Or maybe I wouldn't, but I simply would want to see what you and others would have to say on an audio related topic of my choosing.  Or how about this even...it was a round about way of calling out those who must seize an opportunity to gain at the expense of the guileless, whether it be with audio sales or with auto sales.  Ebay audio sellers take heed...Sorry, but no way am I giving you double the original retail price for a 30+ year-old metered power amp, while I couldn't in my right mind ask for more than maybe 70% of original retail, at best, for a similarly priced and respected functional "black box" equivalent from back in the day.  Sell 'em if you got 'em - just not to me!   

@rwp2964u 
  👍

Probably just supply. Why would anyone actually care?

"Actually" ?

Let me help. Because this is a friendly discussion forum where the bar to ask a question is reasonably modest?