Oh don't worry, either their parents are made of money or they are in serious debt and don't care. I work at CompUSA and I see parents come in and buy just $3,000 set ups off the shelf for their college age or highschool kid who's nothing but a lazy douchebag.
I'm personally not terribly impressed, especially when you compare the graphics from the PC version of Halo 2 to the Xbox version. The graphics on the PC were a step up from the Xbox version so really the difference between the two is even less if you go that way because the PC version was designed to go on similar resolutions like the Xbox 360 Halo 3. The difference is nothing like the jump from Halo to Halo 2.
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