I was once told that this is due to the library system in the US. I was told that you, as an author, get a bit of money when someone is borrowing your book at a

I was once told that this is due to the library system in the US. I was told that you, as an author, get a bit of money when someone is borrowing your book at a library. If the book has a dedication you get a tiny bit more money and that is the reason. I have not verified this information but always believed it was true. I might be wrong.