Quitting your job or dropping some other responsibilities might he reasonable for some people who can live off of their parents money or their own savings, but for many people that means losing their home, their car, or even their children. Indigo945 isn't making excuses for them or himself; he's telling you that for them to make that 10 hours would cost them far more than the new job might give.
Also, if anyone should be able to make another 10 hours in their week to work in tech why not say Steve who works at $BigTechCo? Now I know we just asked Steve for another 10 hours, but lets go ask him for another 10. No, the circumstances shouldn't matter, he's making 6 figures after all. Let's ask him again. And again, And again. Oh, Steve quit? What a pauper.