There's minor versions of the same thing in the wealthier urban areas in the US so this shouldn't be a foreign concept to HN.
Even paying minimum wage, that would be something like $20,000 after taxes. Given that the median household income is something like $60k gross; no, they can't afford domestic staff.
Middle class by the colloquial "everyone who makes more than a kid flipping burgers but not enough to buy an apartment in Manhattan" definition no.