Call me crazy, but I like to spend time with my wife in the evenings after work. I'd like to not be exhausted all weekend so I can go out to a movie with her and not fall asleep in the middle of it. 12-hour days for months on end are tolerable, not ideal, but 14-hours+ for months on end is insanity, it's for young people with lots of energy and no family or friends. And, again, it's not safe. And worst of all, you don't just put your life at risk driving home tired, you put innocent people on the road at risk.
And camera people have one of the few crew positions where you work during the set-up AND during the take. Actors mainly work during the take (and rehearsals, make-up time, etc.) and other crew people work during the set-ups and can rest during the takes. If I step away just to take a piss, there is a PA following me on a walkie reporting on when I enter and leave the john, it's crazy. Or I hear: "he's headed for the craft service table... he's looking at the donuts... no, he's headed back to set..."