IMHO many buying these vintage washers at such auctions are simply fed up with modern offerings, and thus looking for something better.
Word is out on YT and elsewhere that "old school" washing machines are a better bet than what's on offer nowadays.
Believe many collectors or vintage appliance aficionados might or are certainly interested when things like this KA set are brought to their attention. But these auctions work often on a very set time frame.
From what one has seen most of appliances offered at auction largely are part of estate sales. Usually there is only one day with a short window of time to collect won item. Payment is due at once (when hammer drops), and if not collected is forfeited. Shipping is not always offered or an option, so unless a collector is local or can get a reliable shipper in there, it's usually not worth bothering.