Why do people insist on using Windows XP?

I have a question for those die hard XP users out there and any who has a good explanation. Why stay with Windows XP?

I've read many comments by users on various sites that say that they will never upgrade from XP. And I think to myself: Why not? Windows 7 is loaded on all of the machines in my house and I have Windows 8 loaded on to a laptop. My school however is still using XP on ALL of their computers. It is so difficult trying to use XP for the most simplest of things. Launching applications from the start menu, managing open windows, and having multiple windows in view at the same time for typing up papers and researching.

So back to my question. Why stay with XP?