I think people tend to forget that the small details are what make a Mac actually a Mac.
It goes from small touches like a backlit keyboard and multitouch trackpad all the way to using the latest hardware from Intel under the hood. These can add value to the machine, but it is up to you to decide which computer you would like to buy.
Is it actually a $1000 difference? I doubt it. I've seen many comparisons, but before I purchased my Mac I went to match the chipsets used in the Macbook Pro including higher end video chipset with equal amounts of dedicated/discreet video memory only to find that the costs were roughly equal.
That's true in most computers. There are a lot of hidden things that can be cheapened without a user noticing until the thing breaks. Desktop makers love to do that with motherboards, video cards, stuff like that. Basically be suspect of something you don't see in an advertisement.
In the end, being able to run Leopard is what makes it worth a bazillion dollars. I shudder when I think what my life could've been like had I spent it fixing Windows machines instead of doing different stuff where I use Macs all the time. Sure, they're old at work, but they're more reliable than most Windows PCs I used to have.