Art is largely visual rather than functional. Collected stamps aren't used to post letters, collected coins are not used as cash. Collected books can be read.
Various other kinds of collected items can be just admired or occasionally used to.
That's what I was trying to say.
Isn't the function of art to be visually observed? Stamps and coins are functional, and even if collected ones aren't in many cases they COULD be used if desired. They are only held/kept because a number of collectors have determined that certain rare or notable ones should be preserved from an aesthetic or historical perspective and are thus valued highly. I get what you're saying, I just think that books fit this category just as well. Some old ones ARE rare and noteworthy and ought to be preserved. The text may be the primary function of the book, as the primary function of a stamp is for posting, but certain specific versions may have "transcended" their function to be noteworthy all on their own as collectible art. And despite the famous examples of coins worth millions of dollars, most coin collections aren't bringing THAT much of a return. I don't see how books are much different.
An obvious example would be the Book of Kells. It's a book, but almost nobody reads that actual text. It's all about the volume itself being a work of art, not just in the illustrations, but also in the binding, cover, handwriting, etc. That's an extreme example, but where does the line between art and book lie?
I don't have a collection anymore, I think I own 5-6 books. I moved so much in my twenties (I think there was a period where I had 16 addresses in a dozen years) that it simply became too much too move them all the time. Plus, since I was a poor student at the time, I had a habit of trading books in to get new ones at the used shops. Now I only own a few favorites. Honestly, I don't NEED most of those books I read (I just don't see myself yearning for another go at some of those minor, serialized Dragonlance novels) as they're nothing special, in text OR format. However, even as I consider going digital (as I've already done with music and most of my movie collection), I think that now I'm settled maybe I should start rebuilding the old library. In that event, I probably WOULD try to track down particular versions of books I have no intention of reading, and I'd likely do it from collectors over just grabbing a new copy at Barnes & Noble. I'm even likely to do that with authors I want to delve further into, like PKD. For him, I'd just as soon get a cool old copy or Kindle version as pick up an overpriced premium paperback new. So I guess at least I'm glad these people exist and are doing their thing?
As to whether or not family would appreciate it, I guess I wouldn't care much one way or the other. Maybe my kids or grandkids would read some of them, maybe not. Even if they sell a $500 collection of 50 books to a trade shop for $50, at least they'd get a little extra cash out of it and the books would probably help a rare independent/used shop stay in business while potentially making some other collector very happy down the line. I just think that history has value... even if not read, the book can maybe be a nice bump in someone's life on a crappy day somewhere down the line. You just don't get that with unplugging grandpa's kindle and wiping it to sell on the amazon marketplace so you can get yourself a newer model of the same machine.