It does seem surprising... but is it really...?
I've always been of the opinion that there are two types of people who run on the fells (not wanting to categorise everyone).... there's those who simply just love the mountains, and those who feel the need to test themselves to the absolute limit. Why do we feel the need to test ourselves? Is it because we often feel we have to prove our worth...?
As someone who has suffered "problems" (I wouldn't go as far as to compare myself to some of the situations in this thread).... when I look honestly at why I run in the mountains, I probably lie somewhere in between the two types. Certainly having people tell me that what I am about to attempt is "too much" is the biggest motivator for me, and quite often riles me up a bit. What that actually says about my personality or mental state, who knows.... I certainly don't.
Sorry for the ramblings... probably in no way relevant to most people...