I'm not even talking about asking prices - look at SOLD items on Reverb and eBay. These basses have gone from $200-300 boat anchors you couldn't give away, into $900-1,200 basses, one even sold at $1,761! and it was a natural/maple specimen, the most common finish.
What happened? Is there a new generation of buyers that don't mind the weight?
Those are good basses with a genius passive wiring that can mimic a wide range of "name" basses, from EB-0 to Ric-ish tones, but the 11-12lbs. weight killed them in the market. Has gravity changed recently?
Here's a 1981 NOS, complete with protective film on the pickguard, for $2,500:
https://reverb.com/item/47093665