I've seen several posts in the last few day along the lines of "so-and-so is SO greedy, it's all about the money" or "all he cares about is the money!"
EVERY ONE OF THESE PEOPLE signed up for this game FOR THE MONEY. Sure, some are also wanting to get their 15 minutes of fame, or they think it will launch them into some kind of psuedo-celebrity status ("Oh look everyone, there's BUNKY!!") But with the possible exception of Jen last year - THEY ALL WANT THE $500,000 MORE THAN ANYTHING ELSE.
The game is DESIGNED to encourage double-dealing, backstabbing, flip-flopping, and lying. So why do we get so angry with someone for doing exactly that? Why do we disparage someone for trying to win the money? If the rules encouraged "nice" behavior then "nice" people would win the game.