Don’t get me wrong, I love Apple, I just don’t own one.
I think I posted the recent John Sculley talking about Steve Jobs article in this thread. Apple is right, they need to keep OSX on Apple products only. First, it keeps the experience in control of Apple. Everything related to OSX, from the first boot up to throwing the product out is 100% controlled by Apple. That’s powerful. Second, it elevates the experience of the Apple product. A Mac with windows or an Acer with OSX definitely could not demand the premium that a MacBook with OSX has. It would dilute the Apple line to the point of irrelevance.
As for resale, if I hadn’t bought a crappy netbook, I would have kept my other computer longer, as I imagine I would a Mac. However, from the outside, it seems that Macs age faster than PCs. Perhaps that’s just due to the restrictions of upgrading various components (RAM, HDs, processor, video cards).