What makes you think Mac Pros are made for 3D artists? Macs haven't been good for 3D for quite a while, partly due to the very poor selection of 3D graphics cards, but also due to poor software support, poor drivers, etc. It's not (necessarily) Apple's fault, but their Pro workstations are largely sold for one of 3 things - Video editing, Audio editing (they have products for both of these tasks, so it makes sense), and image editing/design (e.g. Adobe Creative Suite type stuff). They are *not* made for super fancy 3D, they really aren't.
I didn't say that graphics cards don't matter, what I said is that huge amounts of RAM don't matter. RAM is primarily useful for lots of high resolution textures, less so for large amounts of geometry, and several applications (e.g. Zbrush) don't even use 3D acceleration for their rendering anyway, so the RAM on the card doesn't matter in those cases. All I'm saying is going from 2GB to 6GB per card is nowhere near as useful as going from 200Mhz to 600Mhz in a graphics chip clock, for example. One is basically 3 times the performance (the chip clock speed), which will be beneficial across the board, the other is 3 times the memory but it's only beneficial *when you're using lots of memory* (which may be sometimes, maybe even a lot, but not all the time to be sure; so inherently the clock speed differences matter more). Does that make more sense?
Oh and as far as I know Apple has never taken a hit on their hardware, in fact they have the highest margins in the industry on hardware. So while I could see an iPhone being sold that way, I'm highly, highly doubtful of them doing that with the Mac Pro. What would be the point? Unlike the iPhone, where they gain a customer who will likely use their huge ecosystem of revenue generating services (iTunes, app store, etc.), a Mac Pro user probably won't recoup that value for them ever (if they're selling it below cost).
- Oshyan