Apparently today there are gobs of folks looking for yesteryears's classics.It depends on what you have to sell.
Collectible and classic vintage 2ch is still going up in leaps and bounds.
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In the mid 90s (pre-eBay) I walked into a used stereo shop and bought a beautiful Marantz 2275 with walnut case and a pair of L100s for $450 for the combo. I didn't really need them, but the price seemed fair and there was all the nostalgia surrounding these pieces. Over the decades since they have been in use in a couple of my offices and in and out of storage. I found the system great for vintage 70s rock, but as I don't primarily listen to that... I used the system mostly for listening to NPR.
These days the 2275 is in storage and the L100s are on semi-permanent loan to a younger friend who uses them in his hipster auto shop. If I was in a flipping mood though, I would have to say that the $450 purchase I made was probably the best audio purchase I ever made.