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The masses don't want to bother with that sort of effort...people would rather throw their stuff away than invest the time it takes to auction stuff off on eBay.
Cost is probably one of the last factors that effect why people purchase PCs over MACs...it has to do with comfort, the package deal, and the way people use computers.
MAC missed the boat when they didn't compete with PCs in the markets that contain big business and schools. People buy what they are comfortable with. "Jimmy uses a PC at school"...or..."I'm used to the PC I have at work"...are the reasons people prefer PCs in their homes. Also the whole compatibility thing comes into play...the main reason I didn't consider a MAC for the longest time...although this no longer the case, people still think this is an issue.
I bought a PC and a printer came with it...I bought the MAC and I got a cool box. People want to feel like they're getting a deal, PC's are marketed that way.
Finally, most people do not mix their creative juices with a computer....it's all business...no frills (or thoughtful operating systems) necessary. If I only use the word processor, email, and surf the internet occasionally...why should I pay the extra $100 now when I'm just going to throw it out when it becomes broken down or antiquated?
By the way, I love my new MacBook Pro...and I paid less than I did for my last Dell laptop.