So you see this kind of argument in the current "labour shortage". Some people will say certain businesses can't afford to pay more and they'll fold otherwise.
I personally don't see the business owner earning an income (sometimes a substantial income) as justification for the workers to earn less than a living wage.
It's the same here: there's no good justification for someone commuting plus working 18 hours a day and getting paid for 10 of those hours.