i use to install dos (3.1) and windows 3.11 on pc's many, many years ago where i use to work, it was a big jump from going from windows 3.11 to windows 95, that jump to me has never happened again..
not from 95 to 98, or to win millennium, win2k, xp, vista or i doubt win 7..
so for most people there is no reason to buy it.. and how many companies who buy new pc's will put xp back on them ??
i can tell you from where i work now, we refurbish 100's of portables a week, and they all have xp on
but then i've never been one of those type of people, who had to have the latest mobile, pc, processor, o/s or whatever .............