What are the speakers you very rarely find in the Used market(Audiogon or Anywhere)?

Preowned Wilson speakers are VERY common to see being sold very much including the most expensive production models (XLFs as you read this on AG & virtually everything else) - however in all the decades the WAMM has been made, I've never seen a single one come up for sale.  All 7 versions (not including the Chronosonic which is arguably too new).  Something peculiar there.

Technics SB E200.  

Getting ready to sell my Aerial 8s for Martin Logan ESL 13A.
Made 70 on 3/10/2019, with hearing loss...”dying” to make one more change before I hear the trumpets call. Am I making a mistake ?

GOOD ONES.

Someone still hankers for a pair of ML Monolith IIIs?  I sold mine 20 years ago and good riddance, slow bass, directional, limited dynamics.  Replaced with Legacy Focus.  Music preference is opera, jazz, classical and pre-1980's pop while wife also wants to enjoy heavy metal and raucous rock.  Focus speakers suit everything while Monoliths had limited appeal even for my tastes.  Generally rarely seen are Acoustats (I had 2&2s), especially Xs which were deemed the big coffin speaker by my late wife.