No, you're wrong on many fronts.
I quite recently bought a new PC, which I'm going to compare with Mac offerings.
Quad core 2.4GHz (ie 9.6 total)
2GB stock memory
500GB stock HD
8x DVD RW
I run Vista on this, and Ubuntu on my other PC which we use for work stuff, so I'll include this in the price, although I'd argue that I could run it with a *nix distro to make it more closely comparable in capability to OS X.
Peripherals are gathered over the years, so I'm not going to include them. Anyone who's interested, my mouse is worth about £40, keyboard about £30 and monitor probably about £80, if that (CTX CRT oO), actually, what the hell. I'll throw in my headset as well.
Now let's compare. iMac first.
Core 2 Extreme
500GB hard drive1
8x double-layer SuperDrive
ATI Radeon HD 2600 PRO with 256MB memory
Ready to ship: 3 days
(£1,216.16 ex VAT)
Worse processor, worse graphics card, I would expect worse keyboard and mouse, no headset, better monitor but I really couldn't care less about that. Let's assume that the motherboard is as good, and, taking a real leap of the imagination, that the graphics card, keyboard, mouse, headset and CPU are balanced out by the monitor, that's a disparity of £630.
Now I don't want to be harsh on Apple so I'll look at the Mac Pro as well. I tried to configure it as closely as possible to mine, ie no software extras, almost the same CPU, same GFX (although not quite, the difference in GFX card, ie the standard single Radeon, should balance the difference in CPU, ie the 2.8GHz quad, almost perfectly), same HD.
Now let's take the monitor and headset off of my specs price, bringing it to £670. 16X over 8X DVD drive is pretty negligible price-wise. Cost of this system?
That's a difference of over £800. Just to put that in perspective, the difference is 122% more than I paid for my system, including Vista. Just for jokes, let's say I used Ubuntu on it instead. I'd be paying £1,019 more for an equivalent Apple system. That's 216% more. Just to point out, I was expecting there to be a difference, but seeing this really does shock me.