I look on eBay to see what stuff sells for. Evidently someone thinks they're worth $1k and another by a relative, I assume, for $150. It all comes down to what someone will pay.

https://www.ebay.com/itm/254095171118?hash=item3b29409e2e:g:qwcAAOSwuNNcS0pc

This one by Tom Barminski looks over priced at $150 but then I expect more for my money.
https://www.ebay.com/itm/124887623280?hash=item1d13e1e670:g:2uoAAOSw~VxgbzSU

The difference between genius and stupidity is that genius has its limits. Albert Einstein