It really is exceptionally rare that I've reread any book or rewatch any movie, and in those cases it wasn't hard to get another copy of the book from the libra

It really is exceptionally rare that I've reread any book or rewatch any movie, and in those cases it wasn't hard to get another copy of the book from the library or find the movie again on Netflix or wherever. Maybe you reuse all of these things, but I think the 99% DVD is watched exactly once. Having these physical DVDs or whatever really is a very mild burden, but even that mild burden is larger than the mild benefit provided, people just like having their DVDs on their shelf because of the intrinsic value of owning "stuff".