My mobo cost about 100$ I assume that if a 1G thumb drive can be
purchased for 20 bucks that you could also add the same function to a
mobo for the same price.
I would think that anyone buying a machine with a PCIe slot would be
willing to pay for advantage of booting from ram instead of a hard
drive.
I would think that boot times from a chip would be much faster than
from a hard drive. I would also think having the OS in area out of
reach to third party stuff would prevent some of the problems XP now
has.
I also realize that machines bought at best buy or walmart would not
add such a feature, but I believe there would be a market for it.
Of course since no one so far has come out with it, I could be wrong
again. (boy, that is a surprise)