I saw an experiment done yeas ago where a scoutmaster took a dozen or so scouts into the desert. He wanted to gage what percentage would thrive and what percentage would fail, of course they had to eat bugs, snakes and anything else they could find.
Right off the bat he found that 20% of the scouts thought of it as a wonderful adventure and had a great time collecting anything and everything to eat.
20 percent just sat down and started crying for their mothers, of course he immediately sent this group home, they would die quickly in a survival situation.
60% of the kids wouldn't eat snakes and bugs initially but would after they got real hungry. These kids went along with the experiment but didn't enjoy it.
We see about the same thing on Alone, some tap out the first day, some hang on for a month or so on but are disillusioned and some are having the time of their life and do surprisingly well considering the adversity they face.