Software will always sell at the what the market will pay. Linux doesn't really affect Windows pricing, because they aren't really competing. The main knock to Windows pricing is from the big system builders, who have to push down every cost to keep their margin. I do hate Microsoft's overcomplex and obfuscating pricing structures. They make the little baby Jesus cry too. Bastards.
The corporate mothership paid for my copy of XP. Really, they shouldn't have. Still, in the time it takes for XP to wake up and rouse itself into a useful state, I can read the news, drink a cup of coffee, write a brief, and answer a few emails on my Mac.