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I bought a top-of-the-line MacBook Pro 17" in February. Great machine - I wouldn't trade it for anything, and plan to use it as long as it works, seeing as how it cost me an arm and a leg.
Six years ago I bought a top-of-the-line Vaio desktop. Still does what I bought it to do quite nicely (mostly audio editing for a radio show, though I'm using the Mac for that more now). My son has our previous computer, which I had for ten years (upgrading it myself as I went along). Next move is probably to give him the Vaio and get a Windows laptop for my wife and I.
Nice to be able to buy a new computer every year, even if you don't need one. Most of us can't or won't. So what if the Mac's "trade-in" value is a bit higher? That doesn't make it less expensive to purchase.