Of the 6000, most have bookmarks. I read at least the first 50 pages of most of them. I've finished a couple hundred so far. I found my old business cards make perfect bookmarks.
I guess "No one buys books" isn't strictly true.
I tried to write 4 books. I was told that I'd likely sell less that 1000. Beyond that would be considered a major win. I finished one, published it, and have made about $500. It took me months to write.
I love books. I have a copy of "I, Robot" signed by Asimov. I really like books signed by authors.