"less affluent ones" is grammatically correct and can be used in written English.
It is typically used to compare two or more groups or things, with the "ones" referring to the second group or thing being discussed. Example: While the first restaurant was frequented by wealthy businessmen, the second restaurant catered to a different clientele - namely, less affluent ones.
Langone Medical Center and NewYork-Presbyterian Hospital, which serve many affluent patients, along with some less affluent ones, had readmissions rates on a par with the national rate.
She said she believed all neighborhoods on Long Island would be affected, not only the less affluent ones.
It could instead have chosen to develop a series of high-speed rail lines across its land, as other affluent countries have done and as even less affluent ones such as China are now doing.
In churches and other institutions, especially less affluent ones in rural areas, reed organs with up to three manuals, a pedal keyboard, and five or more sets of reeds often served in place of costlier pipe organs.
But it has also opened the door to abuses, as credit issuers have used predatory techniques to lure customers, particularly young and less affluent ones, in countries where regulation is scant, annual interest charges can top 220 percent and consumers cannot seek bankruptcy protection, economists and consumer defense groups say.
In this area of the country, higher-end sellers are less willing to drop their prices, while less affluent ones may want to cash in their chips and get out.
It is quite unacceptable that the debts of a more affluent generation should be landed on a less affluent one".
But within the city, a recent UCLA study examining a decade of Department of Water and Power data showed that on average, wealthier neighborhoods consume three times more water than less-affluent ones.
[Focus Group 4, Older, Less Affluent] One of the reasons why focus group participants found HPFI unacceptable may be partly related to them questioning the effectiveness of such schemes.
Small cars have better mileage but even less affluent owners.
And unlike some coastal areas to the north in Oregon, the southwestern coast, however stunning, is several hours from any major population center, much less an affluent one.
