I have a bunch of movies on dvd or bluray. Mostly pixar and disney stuff for kids. We never touch them. Kids would rather watch something they haven't seen. I keep them because why not, they don't take up tons of room like VHS tapes did. Probably will be thrown out or sold to a vintage store in a decade or two like old records.
Trying to sell old movies on VHS I found out some things.
- If the movie is re-released on a new format. The old format has little to no resale value. You can still get something for some DVD movies because they are good enough. They'll probably become worthless once 4K becomes the norm.
- Mass market items have no chance: Millions of people bought Disney movies and kept them in mint/near mint condition. If it isn't in mint condition. No one will buy the old format version. Unless it is ridiculously cheap. DVD can still sell due to low shipping costs, especially a small lot of appealing movies, they are still good enough and many people don't understand the difference. I tried selling Disney movies individually, in collections and even a whole lot (I had every Disney animated film as I was a Disney fan as a kid). I couldn't even get a bite when selling at shipping cost. I have a good sales record on eBay, I'm not a power sale but I had a few hundred good sales with no negative reviews. I also had collections of other popular movies/actors. Tried a John Wayne pack, Jimmy Stewart, Arnold Schwarzenegger, war movies, documentaries, looney tunes, period pieces, westerns, &c. Nothing, didn't matter if the starting price was $1 plus shipping, low buy it now, starting at shipping cost (free shipping listing). I let the ads auto-relist for months. I think I sold ten or fifteen movies and brought hundreds to Goodwill.
- The only old format that really has value is when there is no new format option. For VHS cheesy horror flicks have a high resale value if they were never re-released. Not many copies were ever sold, they were never re-released and old cheesy films have a cult status. Therefore, they can have a high value. Because VHS is the only option for physical ownership and legit copies are hard to find. Some people buy them for box art so case condition matters. I remember a friend spent $250 for "Naked Lunch, 1992" on VHS because it was hard to find. It has been finally been re-released on DVD and Blu Ray. Now that VHS copy is worthless. So, the only Disney movie that has much chance is an old VHS copy of "Song of the South". There is no way Disney will ever re-release that. At least not until racism becomes such a distant memory that no one can relate to it anymore and is something just read about in history class. Like burning heretics/witches at the stake.
- I'd expect Blu Ray copies to take many decades to ever be worth anything meaningful once they are obsolete. Perhaps when your kids are retired. Those old copies will have enough nostalgia factor and enough copies will have been tossed to be worth something. At least worth enough to take the time to list, pack and ship.
Video is not records. Records, Reel to Reel even cassettes add their own character to music. CD beat out records because of durability, length and convenience. Records have made a come back because they add a warmth and character to the music being analog. As long as there isn't a decline in the condition of the recording. They give you an excuse to focus on music. Plus records have large and intersting album art to display. CD sales have plummeted because streaming/digital purchase can offer the exact same quality (both are digital), with infinite durability and vastly superior convenience. Video is different there is a noticeable and quantifiable difference in quality between generations. Although we are reaching the point where visual acuity is becoming a limiting factor.