In many DayZ community discussions, the topic of motion sickness has often come up as a common reason that players avoid first person.
I wondered why this seems to be a reoccurring complaint, as I've rarely heard of people mentioning motion sickness with other FPS titles. I then came across this post on Reddit and realized the problem may be a result of some of the default settings:
http://www.reddit.com/r/dayz/comments/2jp3nx/dayz_1st_person_makes_me_sick_please_help/
I take for granted that one of the first things I do in any game is tweak the video settings, but my guess is there is a majority of new players who do not, and simply switch to using third person as a means to an end?