A great essay on why piracy is not harming legitimate sales of books but DRM is...

Quoted: Electronic copyright infringement is something that can only become an "economic epidemic" under certain conditions. Any one of the following:

Quoted: 1) The products they want—electronic texts—are hard to find, and thus valuable.

Quoted: 2) The products they want are high-priced, so there's a fair amount of money to be saved by stealing them.

Quoted: 3) The legal products come with so many added-on nuisances that the illegal version is better to begin with.

Quoted: Those are the three conditions that will create widespread electronic copyright infringement, especially in combination. Why? Because they're the same three general conditions that create all large-scale smuggling enterprises.