No kidding. Who pays US $3-$4.50 for a used book at a charity sale? I don't think I've ever seen them priced at even half that.
If I buy ebooks, the author gets paid, my shelves (and floor joists!) aren't under any additional strain and there's no need for trees, land-clearing, ink, trucks to haul them around in, etc. I buy pbooks that are less expensive than pbooks (from Baen, for instance). Since I'm spending less on books, I have more money available to donate to my regular charities. Or Calibre.
