The point is being able to pay $350 for a loaded system or $650 for a loaded system + 2 17" LCDs and still getting the performance boost, by finding a way to OC. Yah sure you can take the easy way out and buy a mobo for $200+ that will change voltage, fsb, and even multipliers on some chips and have it easy but what would be the fun of that?
For example Dell just had a 9100 you could purchase for around $700 that included:
17" LCD
955 chipset mobo
p4 630
geforce 6800
1 gig ddr2 533 fsb
160 gig SATA HD
DVD burner + more such as WinXP
and for those that want to get a very nice system for $700ish, you can't do better than the above especially considering the 630 will OC to 4 ghz.