There are definitely people that collect older media for use in the retro setups.
I constantly buy New Old Stock when I find Floppies, Mini Disc, Cassettes, Zip Disks, hell just about anything. We're a weird bunch of collectors but we're out there.
Somebody here is going to be very rich one day, just safeguard them against elements
Looks like you can still buy 10-packs on eBay for £15, not really collectible yet it seems :-)