"Mass produced" doesn't mean the same thing with regards to old computer equipment. If you had a Sound Blaster Pro in 1993, then you were probably the only person living on your street to have one. These days every second house probably contains at least one iPhone.
Add to that, the fact that (due to our species "awesome conservation skills") most of the 30 year old computer equip is now helpfully spreading it's chemicals into the earth of various landfills around the planet. An already tiny supply is now far tinier.
Add that that, the fact that the small amounts which are left are increasingly dying, year on year, yet further reducing that already-reduced amount, of what was only a tiny market to begin with!
Also, "how much $ is an experience worth" is an incredibly subjective concept. Nostalgia, the ability to do the very same things you did when you were young, using the very same things your young self did, is a massively valuable experience to many human beings. The suggestion that once over a certain age, things cannot possibly be of high value, is a very strange concept to me.