[Patrick del Poker Grande]

It's marginally wrong. There's still some sort of convenience factor that you're not paying for. Also, in the case of the library, the book was paid for by the library. You paid for your share of the book through taxes and whatnot. Also, each copy of the book has been paid for and only one person can have acces to it at a time. With the e-book, many copies are made and distributed. There's no limit on how many people can use it at one time and this hurts its earning potential.