I wish we could hear more about what drives his fascination for such a niche item. How much has he spent on these machines. Im so taken by how clean everything is. Well maintained and cared for. Hopefully someone comes through.
I get the feeling there is nothing more to this story, he bought 8 washing machines at auction, thus becoming known as the "washing machine guy" (possibly from trying to sell them on) and naturally became the guy to talk to about washing machines. He has clearly been very fortunate to obtain the means and time to curate such a nice collection, but sometimes that's just how men obtain an identity: you play the hand you are dealt, and he has played his hand excellently.
I've been to a sewing machine museum in lausanne, Switzerland. There is also a typewriter museum somewhere. I don't see why there wouldn't have a washing machine museum... I would definitely go.
I'm a sucker for old but useful items that still function like a champ. The "modern" washing machine will break down and be landfilled after a mere 5 to 10 years while those machines have outlived multiple generations. Finding someone to take ownership of all of them is obviously an impossible task. Finding good homes where individuals with a passion for that kind of equipment seems like there would be more takers. Get Tom Scott to go visit this guy.