Many people who work long hours find their work enjoyable and would rather work extra 2 hours than do boring household chores that they hate. I am one of them - cleaning up house is like pulling out teeth for me.
I'm paying an accountant to do my taxes, not because I can't do them; but because I don't want to. I mow my own lawn, because I don't mind doing it. I pay someone to clean my house once a week, not because I think it makes me better off financially, but rather because it is no fun; I would rather do something else (e.g., engage in some kind of home improvement).