I don't know if this is true but have you seen the TV series, the bear? I'm pretty sure that most of the stresses of life in the kitchen is portrayed there so the reason why fancy restaurants aren't a thing in most ghetto areas, not to mention that the possibility that in a ghetto area, that the violence might exist and that you're restaurant might not last long, also, there's the fact that people might not appreciate the fine dining experience because they want to eat something that actually nourishes them and is worth it for their already tight budget.