Yes what you say is very true.
I have a friend who is an "Alvis" fanatic, I take him in our horse box to the "Alvis International" with bits for his one and only annual stall to sell. We have been to many Auto Jumbles all over the country him looking for Alvis, me looking for boaty and Ford "D" series bits and they are all going the same way.
"Newark auto jumble" used to be very good but now even it's a waste of time and to expensive.
So eBay becomes the leveller.