I 'believe' that many who come here and quit their day jobs are usually doing it for _startups_ and/or _app dreams_.
Nathan is working hard, doing as many things possible. Not many people can do this (unless/until they reach some desperation factor which makes one realizes the need to _hustle_ and get stuff done).
Bottom line, it's hard work and all sweat. Of course, knowing what industry sells and finding what niche your skills fit in work too.