I love this show, but I have such a difficult time watching people lose that I have to change the channel at the end - even when I know who it is.
Same with Survivor (on most occassions, anyway). I tend to like nearly all the contestants. Even when people are being extreme, I can't really blame them much given the conditions they have to endure.
For most other competitive shows, I don't seem to have this problem. Just these two.