You have a point too.
Basically when buy a game, a cd, or a dvd we are buying the contents of what's on the disc, not the disc itself. As opposed to when we buy something else we're buying the actual physical product.
However that argument can lead to two other opposing views:
1. You can argue to the RIAA that buying a CD is like buying a plane ticket. You're paying for the contents of the cd, not the actual plastic disc. Just like you're paying for the flight, and not the physical paper ticket you get. If you loose your ticket, you will get another printout of it if you call the airport for free. Same concept can be applied to a movie or a cd.
--HOWEVER--
2. The RIAA can throw that back in your face with this: If you buy a book or a magazine, you don't really care for the pieces of paper, but you care for the contents of those papers, or the information you get out of reading the book or magazine. But if you loose your book, nobodys gonna give you another free copy of it right? However there's a loophole in that too because we have the right to scan or photocopy books and magazines.
My...its very confusing.