If these nobles needed to hire Ren Zhong's people to work, then perhaps it could be discussed. However, according to the terms of trade proposed by these individuals, they explicitly emphasize the commodification of these people. If people were really sold over, Ren Zhong believes that these citizens would have absolutely no chance to realize their ambitions and would only become lifelong docile "stud horses," without any opportunity to engage in substantial work, essentially becoming slaves.
Therefore, despite being tempted by others' offers, Ren Zhong ultimately refused all propositions involving human trade without hesitation, effectively cutting off an important source of income.
