I can't resist doubling-down on Mordred's statement: We have no idea what the overhead of the business is, since the dev isn't giving us those numbers. We know he has to buy all that food they're cooking. He has to replace damaged items. He has to plan for utilities, property taxes (which he seems to be aware of), he IS paying the girls that are working ('cept maybe some of the newer ones that forced themselves on him), we don't know what the status of the property is (he appears to own it outright, but it was abandoned for a long time, so that's not guaranteed, might have to pay a loan off), He hasn't been open for a month and he's already reconsidering his future plans, which probably is already effecting his future spending habits ...
I honestly don't know how the MC could have started any of this without a full equity line of credit financed against the restaurant, and he probably couldn't have got a very good rate ... every indication at the beginning was he didn't have much money when he arrived, and he's still in high school, so he CLEARLY doesn't have a good credit rating. That alone would make someone with even a modicum of caution frugal. so unless Daddy Warbucks left him more financially stable than he appeared ...
But most importantly: The focus of the story is on the characters, not the financials. The story currently requires some of the girls not to have phones yet, so they don't have phones.