Love this video. My collection includes some of what I saw in the video, especially the Commodore PET, BBC Micro....the NeXT isn't really old enough to be found in these retro gatherings and it's also a 'serious' computer so you wouldn't normally expect to see one there.
At the time the machine consoles and early computers that came out were relatively cheap and of course all of you know the NeXT was not that but it was also a 'real' computer.
Today something like the Commodore PET is a novelty really but it often sells for more than it sold for back in the day until you take inflation into account. The BBC is also a 'novelty' computer but you'd be surprised at what people have been able to do with this humble 8-bit computer, including connecting it to the internet. Don't get me wrong, you're not going to browse web pages but you can download straight to the BBC with the right set up just to easily get files. I don't bother with that, I use a USB stick if I want to transfer BBC Micro programs to one of my BBCs. I do that with a 'modern' piece of hardware called a DataCentre, created by this guy in the UK. It's a marvelous device but because of a certain chip becoming rare and hard to get, he's stopped making them. Glad I got 3 of them before he stopped production.
They are right in saying the cost of retro computing is going up, it's become quite a market out there. I bought an Amiga 500 with lots of accessories and games, some serious software for $600 CAD. That was actually a good price for what I got and for what the market was bearing. My uncle had one of these and I wanted to see what the hubub was about on it. It's a pretty good machine, too bad they kept the same type of BASIC with it that the PET and C64 had. It should have been improved but then again, that's MS for you.
Anyway, very interesting article, thanks for posting it.