Just because Apple doesn't do it doesn't mean that a lot of others don't. I've had Commodores and several x86 machines and that was the only non-Mac that broke down. Now, to be fair, I have to point out that I didn't get involved with the Mac world until January of '99, so both of my Macs really haven't had enough time to completely break.
Point is that a lot of computers are meant to break after a few years.
Also, if you think Apple really gives a damn about machines it sold a few years ago, you're fooling yourself. That might not have been his exact words, but similar. Jobs pretty much told everyone that their machines aren't worth spit back in January. As I mentioned, Apple, like every other company on this planet, is woried about the bottom line. It did good when you bought the machines years ago.