If your guy somehow found a way to make a lot of money out of it that didn’t involve 18 hour days, 7 days a week, then fair enough.
2nd busiest Dominos in the UK pretty regualarly at the time. He did work VERY hard though yes, but that was his plan, work hard then retire.
I used to quite regularly take home £60+ for 3-3.5 a hour shift, after I’d paid my fuel (Owner driver) £50 was a poor shift.
Wages were £5/hr (This is 8/9 years ago) + 10% of your takings as a bonus/milage, which went up after 20 deliveries + tips. Bonus was paid in cash on the night, so no tax, same as for tips.
It was good money even for the drivers. 3 shifts a week basically enabled us to buy our first house…. 🙂