It's an interesting subject. Once the original book/album is paid for, what does the owner own? Do I have the right to give away or sell my property (i.e. the book or album)?
What about used cars? Furniture? Property? What portion of the rights to these things does the creator of them own...and how is that different, really, from words or music, which aren't even physical? And how do you assign value to an idea...or depreciate/appreciate it's value in the marketplace of ideas?
Just interested in the discussion here. I do buy used books and music. I believe the original purchase of the item satisfies the rightful need of the creator of the book or music to be compensated. Indeed, if I like it well enough to go out and buy other titles brand new, it could be argued that the author/musician owes the person who sold it to me a 'promotional fee'. Or me, if I recommend the book.
I think it's a fair use thing - as long as the content is not commandeered for commercial profit, I think the resale of the physical items is OK.
However, do not EVER buy a book that the cover has been torn off of. This often means it was unsold in the bookstore and the author did not get any compensation or credit for that copy.