In my opinion, the value of an album is, and will continue to be, based on the amount of heart and soul an artist has bled into a body of work, and the financial value that artists (and their labels) place on their music when it goes out into the marketplace.
Piracy, file sharing and streaming have shrunk the numbers of paid album sales drastically, and every artist has handled this blow differently.
Music is art, and art is important and rare.
Important, rare things are valuable.
Valuable things should be paid for.
[Taylor Swift on removing her 1989 album from Spotify]