You think it's hard to find a service manual for a '71 Polara, or some piece of trim? What if you have to figure out a defrost circuit problem, or your KDS-17 isn't draining? Your odds of getting a repairman who can fix it are about the same as taking your to Polara PeP-Boyz for a tune up.
Here's a sample post from their For Sale page, specifically the thread for UK collectors:
Thread Number: 63976 / Tag: Classified Ad Finds
Classic UK Appliances & Kitchens February 2016
I used to have pinball machines, and went to plenty of shows and auctions. A lot of freaks at those events
I still go to toy and train shows and events. A completely different crowd than above, much more somber.
Now and then I also will attend a" antiques and collectible" event. When one pops up local. Never been to the secret society of appliance collectors of America shows.... I bet it would be interesting.