I've flipped through a bit of Kondo's book when I was working at (of all places!) a bookstore. And the book All That Remains by "The Minimalists" actually came at a great time for me as well. I knew someone who was working for them who gave me a copy by chance.

Giving away books is something the digital copy can't match. But again, for the amount of times it happens that I know someone who'd actually read a book I had - I'll just pay to buy them a copy as a gift!