The theory is sound, but the action is amoral. That would be a greedy thing to do, not to mention selfish. The destroyed books could provide someone with a lot of happy, happy someone may not have a lot of. Happy is worth more than cash. I recently gave away my signed 11th printing copy of "The Story Of Ferdinand". The look of joy that spread across my friends face was worth so much more to me than the book. I loved that book but I loved her more. I will replace it at some point, but the psychic return for the gesture probably added a year to my life. It isn't always about getting.