Debbie recently observed that MasterChef seems to be more friendly among the contestants than other reality TV shows, and from what I've seen, I agree. My only theory is that it's because they don't vote each other off and there's no strategy besides being the best chef. Granted, not everyone will excel at every challenge, and sometimes they'll have bad days, but there's never any advantage in backstabbing or playing politics, so nobody bothers. It's refreshing.
Mokalus of Borg
PS - Or maybe cooking attracts a better class of person.
PPS - Could be both.