Share 'Free Downloads via Libraries'

I noticed today on Galley Cat a notice that the web business Overdrive reports a 76% increase in downloads by library patrons. Overdrive makes available 50,000 books and 10,000 e-books to owners of iPods, Zune, or other electronic devices. My question is: why would anyone spend money on an electronic book (or a print book) if they can download it for free without the customary waiting period t...