and we've only had 13 quitters... 2 being from the same season. I think that's actually not that bad considering how many people have played...
1 Quit before the show started (Melissa)
1 Quit because family member dying (Jenna)
2 quit because of medical reasons, but was not an actual medical concern (Gary, Dana)
1 quit to give up their spot for another (Janu)
3 quit because they couldn't deal with the elements (Purple Kelly, NaOnka, Julie)
1 quit because he was "sick" and then quit again because he wasn't in control (Colton)
1 quit because she feared she'd fight another contestant (Lindsey)
and the rest I don't really know because I didn't watch their season.
And you could also include G.C. into this group because if his tribe didn't vote him out that night at tribal, he definitely would have quit before the next tribal.