"Maybe everyone else is like me, too much gear and generally happy with their sound."
Reading these posts, I doubt it is everyone, but at least there is two of us.
It is interesting to see that people are actually buying and selling a lot (relatively). A poster with a dozen speakers bought in just a few years. That is wonderful and dedication to the hobby, but the pool of people that do that is probably limited. It would be a new pair of speakers every few months. I dread moving mine even for vacuuming the floor around them, much less carrying them somewhere and bringing new ones in.
When it comes to prices we should not forget that this hobby is really about equipment. As much as we can drool over some piece and have emotional attachment to it with all the lovely words attached, once we decide to sell it, it is nothing but a piece of junk we are trying to get rid of. It may be sad, but it is how the rest of the world sees it. If nobody wants to pay more than 33% for it, those who may appreciate our lovely piece may not be in love with it quite yet. Unless they buy it for that 33%, they will never fall in love. Maybe the "fair" price level has simply been reset from, let’s say, 50% to 30%. There is a new kid in town and he does not care about our feelings.