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I don't know. Is it just my imagination, or is it getting harder to find vintage 5.25" floppy era IBM PC software on eBay?
It stands to reason. Most vintage computing stuff either is in the hands of active collectors, or is found in estate sales when somebody dies.
Might see a burst of eBay activity when a collector gets out of the hobby or wants to offload excess. But too often the stuff just goes in the trash when somebody dies. It really bugs me to think some collector out there is just sitting on a pile of rotting uncarchived software out of some pedantic fear of what Mickey Mouse(R)(TM) might do to them in their sleep.
After all these years of scouring eBay, I've probably developed a bit of tunnel vision. And an empty wallet.
I really hope people are reading the "seen on ebay" threads by both myself and IBMPC5150. If YOU see anything interesting on eBay or other sources, PLEASE chime in!
I also hope that once and a while someone buys something and has it preserved. Even if you don't feel comfortable with Winworld, fine, send it up to Archive.org, Vetusware, or BetaArchive. (If you put it on Archive.org, perhaps drop us a line so we can see it, it is hard to find things on that site)
By my estimations, by now there is a lot of early PC (or other platform) software that simply no longer exists.