New York City is the manicure capital of the US.
Saras Maslin Nir in the NYT about exploitation, abuse and racism in the nail salon business:

‘Some workers suffer more acutely. Nail salons are governed by their own rituals and mores, a hidden world behind the glass exteriors and cute corner shops. In it, a rigid racial and ethnic caste system reigns in modern-day New York City, dictating not only pay but also how workers are treated.
Korean workers routinely earn twice as much as their peers, valued above others by the Korean owners who dominate the industry and who are often shockingly plain-spoken in their disparagement of workers of other backgrounds. Chinese workers occupy the next rung in the hierarchy; Hispanics and other non-Asians are at the bottom.
The typical cost of a manicure in the city helps explain the abysmal pay. A survey of more than 105 Manhattan salons by The Times found an average price of about $10.50. The countrywide average is almost double that, according to a 2014 survey by Nails Magazine, an industry publication.
With fees so low, someone must inevitably pay the price.
“You can be assured, if you go to a place with rock-bottom prices, that chances are the workers’ wages are being stolen,” said Nicole Hallett, a lecturer at Yale Law School who has worked on wage theft cases in salons. “The costs are borne by the low-wage workers who are doing your nails.’

(…)

‘Ethnic discrimination imbues other aspects of salon life. Male pedicure customers are despised by many manicurists for their thick toenails and hair-covered knuckles. When a man comes into the store, almost invariably a non-Korean worker is first draft for his foot bath, salon workers said.
Ana Luisa Camas, 32, an Ecuadorean immigrant, said that at a Korean-owned Connecticut salon where she worked, she and her Hispanic colleagues were made to sit in silence during their entire 12-hour shifts, while the Korean manicurists were free to chat. “For two years I suffered from headaches,” she said. “It was just the stress that was killing me.’

Read the article here.

Full disclosure: I visit a nail salon on the Upper East Side on a regular basis. I pay approximately two hundred US dollars for manicure, pedicure and massage.

At least part of the bad working conditions in nail salons could be ameliorated when customers would tip more and tip discreetly.
But as we all know, stinginess is extremely addictive.