Many locales have laws that do not allow remuneration above the 'reasonable wage', to prevent tax circumvention by having employers spread wage payments across multiple family members of employees, but I am not familiar with any jurisdiction with a minimum reasonable wage law or regulation. Could you please link some source for the claim that business owners are required to accept a 'reasonable wage'?
https://www.irs.gov/businesses/small-businesses-self-employe...