Gregory, are you worried about too many or too few on the used market? There are currently 3 on reverb and only 1 used on eBay. One thing that stands out to me is that across the line-up, used Quilters seem to hold their price quite well, usually only around 20% off the new price...
I think what I've probably seen Bill, is the impulse-buy gear junkies that grabbed them quickly and then decided it wasn't for them. The ones I've seen have been in the TalkBass Classifieds almost weekly. (or maybe it's the same poor unit, over and over?!

No quibbles on the used price though... they seem to be, as you say, holding their own. And I don't care that much about resale. I tend to just keep stuff forever... I still have the Crate Acoustic 125 I toured with back in the 90's believe it or not. A capacitor or something in it somewhere flakes out every so often, so I don't gig it anymore. Can't bring myself to pitch it, and nobody's had any luck fixing it.
@soflbass (sorry, can't remember your name... was it Ken?) the Mesa D-800 and the Plus model is on my list too. I really don't have any particular gripe with the WalkAbout amp, and I could just pull it out of the combo-cab and use it, but then I'd be kinda' stuck with trying to sell/ship a 50-some lb. weird cab with a passive radiator that doesn't work too well with much else. It is absolutely
violent with that WalkAbout amp docked in it though. FWIW, Mesa now has an 800w version of the WalkAbout sorta' mixed with the D-800.
And Allen, anytime man... I am actually working in my shop again finally. The first big job, coincidentally, is an American Standard upright, with what I believe is probably a busted neck block. Must confess, I also came into another DeArmond Starfire II recently, that I will probably convert to fretless once Mica gets the Custom pickups and mounts done for the other one just like it. I have discovered that short-scale hollow-bodies are quite comfortable to play, especially when seated.
Thanks for the encouragement fellas - much appreciated!