Which is an understandable and logical point of view. Here's the counterargument.

Let's say I want to listen to an audiobook of the latest Dan Brown or Laurel K Hamilton novel. I could:

1. Buy it from a retailer, either in CD format or in a DRM-protected digital file format.

2. Borrow it from the library (in either of those formats), make a copy of it, and "return" it to the library on the library's terms.

As soon as two or more people do the latter, that's removed one or more potential sales from the retail food chain, and the publisher (and the author) get less money than they otherwise would have.

The argument that you wouldn't have ever done (1) and thus (2) was your only option, isn't a valid one. It's an entertainment item. That argument doesn't work for pirating video games and so it doesn't work for copy-protected audio files either: "I can't afford to buy a game for 50 bucks, so instead I rent it for 5 bucks and copy it." It's still piracy.

(Still playing devil's advocate.)