And Libraries are the napster of the book reading world! I smell law suit!!!
Most people will read a book and if they like it, buy it. In fact books unlike mp3s gain a cult like following and people will actually buy multiple copies for different covers or releases. I have always said that sharing doesn't hurt a business it helps grow it. Heck half of the music I have bought has been because some one else sent me a clip or link to a stream, not because I followed the band from birth and mindless followed their music..or heard it on the radio. The reason the music industry is hurting is because they aren't adapting to the new technologies...cds are 26 years old (October 1982) so yeah cd sales are down, start selling mp3's online and wow they make money again. ITunes isn't hurting.
Start offering multiple versions of songs (live, unplugged, special events like woodstock, studio, etc...) and you will actually sell more of the same product!
Will people steal it? Sure but then again google & file sharing works both ways, find them and shut them down.