In extreme cases, they are so locked in this mindset that they point-blank refuse to try anything else.
Yeah, I've had this kind of thing happen to me. One of the staff where I work thought I was installing hax on his computer (it was OpenOffice) because it was free. They were so adamant they were right that they went out and spent A$400 on a new copy of MS Office. This person uses Word to write two paragraph advertisements for houses - no formatting (Administration does that). Hey, he could have used Notepad for that.
Crap it annoys me. The only solace I get is that I can laugh in their face (behind their back, of course) at their stupidity.