Mo Yue immortal city was a new city, it didn't build a slum region. Ye Mo built an immortal city not a charity city. Those who couldn't afford to stay can only wait till the day Mo Yue sect took in disciples. Those who were accepted didn't have to pay one immortal crystal and would have a better cultivation environment than Mo Yue Immortal City.
The immortal city was done, Ye Mo started to build the Mo Yue Immortal City defense formation as well as the immortal spirit chi gathering formation. He placed the last top grade immortal range below the city.
When the formation was done, Ye Mo didn't intervene in city management. Yi Teng and them were still responsible. He went into the main peak Mo Yue peak and started his construction. It would be him, Luo Ying, Ning Qingxue and them staying here so he must build it himself.