cogadh: There's a reason, you are paying for the coolness and exclusivity of being a Mac user. Think of it like a membership fee for the Cult of Jobs.
DarthKaal: Aw, come one guys, don't start with low arguments concerning the price of Macs...
When you buy a Mac, you buy the hardware in it (generally superior to low-price built PCs), you buy the design (well, ok, it's not so vital).
Something I always keep in mind: on Mac OSX you don't have troubles with virus, the OS is a lot more stable than any Windows... I mean if you count time consumed to fix anything on your computer as money, PCs are a lot more expensive...
Actually, the hardware in current Macs is no better or worse than what you get with a current PC. If you were to compare the current mid-range Mac to a mid-range Dell, you would find comparable or identical hardware, but the Dell would be up to hundreds of dollars cheaper. Why is that?
The virus argument is really moot; the only reason Macs don't have virus issues is because almost no one (comparatively speaking) uses a Mac. They are no safer than a PC, its just that no one bothers to write virii for them (well, not as often as they do for Windows). If more people start using Macs, you can be sure that will change.
The stability argument is also moot, since Windows has not had a significant stability issue since XP was introduced (don't believe everything you see in those Mac vs. PC ads). Personally, I don't often spend any time fixing anything on my PC that I didn't intentionally do to it anyway (I tend to break things just to see if I can fix it). Besides, if Macs are so error free compared to Windows, then why does Apple need "Mac Geniuses" to explain to people how to use and maintain their Macs?