It isn’t uncommon for people to not want to upgrade. Even new car models can get people upset if the new design does not stay "true" to the designs of earlier models. Still, the word on the street regarding Microsoft Vista is that it is a pain in the $^&* to use since some software and peripherals still don’t work with it.

In addition, once you get it running, the performance is just too slow to justify the switch. Many people want to stick with XP for the foreseeable future. The Wall Street Journal has some good analysis about the situation including a discussion of a new website titled SaveXP.