OSX for x86 would not work. Too many devices that would have to be added support for. Thus OSX would loose some of it's appeal (I can for instance install OSX to a FW drive and boot off of it on any Mac within the last 4 years - Windows 2000 refused to boot on from an internal drive which wasn't in the original computer I installed 2000 in). We have one place to download drivers from - Apple.com, Windows users have to keep track of what internals they have and frequently visit sites for driver updates (Nvidia, Intel/Asus, Creative, etc). Also, Steve Jobs believes Apple shouldn't be going for market share right now.