As Paul points out, people have this attitude (and I'm one of them sometimes). I'm a scientist and I'm all for zapping myself with magic lightening machines (see xkcd reference cited below) on my own dime and at home, but if I were a sysadmin again I wouldn't be doing that with other people's valuable data. I'd be saying "gee, reiserfs bit me once so now it has to go out of its way to prove that I should use it over something I know is just going to work". This is also why in the real world people are still running OS releases from several years ago, and why they want them supported for the next million years. Because it works and that's all they want.