one of the situations are: theses brand(s) in their prime time where premium stuff, high priced ones, high prices for the options ... rock solid or better designed etc .. not perfect in usability loll as Dave mentioned in some videos. But once again it was "then" and "now" is different
nowadays the market is flooded by sub brands, some mid ranges ones etc ... the big ones of the past or now for most DIY persons, techs or elses are out of reach and can not be compared to the actual ones, pricing them for resale is complicated because people compare the "now" vs "then", and yes you can grab popular ones who can be "upped" for free who add lots of value to them for zits.
in this case no pun for the seller, i would lower a bit, but at some point as previously stated message, the
@OP as of now vs the actual market ... may take time if he's patient, unless desperate ... but eevblog is not a good place for some of theses sale(s)
there is too much actuals competitors, and people does not see the real values of theses "oldies" price is the main factor vs quality and longevity, nowadays piling cash, is hard for many people
and now it's the bit fight: 12 bits is better than 8, 14 is better than 12 or 8 yada yada, and yes in some case it's a big dfference ...
i play with Siglents, Rigols, ol TEK ones, others ... really depend of the usages / needs
but now the thread derail a bit ...