Dumb Question about thru-hikers!!! read now and answer!!!
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The reasons for stopping include being cold, hot, hungry, thirsty, lonely, bored, injured, broke, not being what they expected it to be, sick of rain/snow/drought, disgusted with being filthy, etc.
You are correct, however other than the injury one, those are the reasons I like LD hiking. Once you find out you can be all those things and still be happy, life is a lot better.