I experience pretty heavy doses of nostalgia from time to time, luckily it's always for the content rather than the delivery format of said content, so I'm happy to stream it, or buy newer formats if available and believe I need more than one "dose" of it 
I still have nostalgia for physical formats in and of themselves, as they provided a sensory experience most of the time, but I never quite understood the nostalgia for things like cracking of a vinyl record, or tape hiss, and those are the things that tend to be the driving factor behind a resurgance in popularity of old formats, and then they get a secondary boost because younger people who didn't experience them at the time get to experience a novelty and / or ride the "obscure" train for a bit (or at least, this was the case when it became trendy to release new music on older and more obscure formats in the 2000's).
Printed books are probably the only format that can elicit any sense of nostalgia for the format itself, as I don't get to sit down and read one too often these days. Plus, I can't read ebooks (hurts my eyes and I occasionally experience motion sickness), and while I love audiobooks, and know it's the same story, it's not quite the same experience,
@davewil1964 wrote:
As a physical book seller I automatically have an aversion to other forms, but I must say I prefer to build a picture in my mind of the characters in fiction, rather than have somebody else's interpretation overlaying it.
If it's possible to have nostalgia for an experience you never really had, that's the way I feel about audiobooks - or some of them, anyway. Storytellers, bards etc were around well before books were a thing, and they were often theatrical, so I find the experience of being "told" a story in the same way kinda... quaint (for lack of a better word, I mean it suits, but doesn't quite match). Just like most performance arts, the skill and suitability of the narrator can make or break the story, which sucks when there tends to only be one version, some of them can elevate a story well beyond what my own brain would do, others can't really hold my attention for long at all, or as I was listening to them, I knew I would have enjoyed the story a lot more if I had read the book (Gentleman Bas*ards trilogy was a perfect example of this, really enjoyed the stories, the narrator obviously very skilled as the character work was great, but didn't quite do it for me in the non-speech parts so my own "voice" would have done a better job for those bits ).
When it comes to non-fiction, it doesn't matter so much as then it's really just like listening to a podcast.
@gec, I probably didn't make my point very well (or at all, lol) because I got distracted by looking at what's actually trending consistently and theorising as to why, but what I intended to say is that you can actually say that about anything. Tons of comic book collections, record collections, video game collections and so on, would be worth extremely small amounts. A few here and there would be worth thousands, all because of a few titles that more people than there are copies available of, want to get their hands on.
What really matters is on average / in general, to your average eBay seller who is buying / selling "vintage" media. I doubt there's much money in going to garage sales specifically trying to turn up a hot VHS title, it may be marginally more worthwhile for video games and DVDs, if you can get the right ones, or lots of ok ones at a low enough price - i.e. I suspect there would be a bigger market for a Mulan DVD at $5 than a Mulan VHS for $20.
