Mr. Zhang is the head of the company. He likes the OneDollarGlasses and is happy to be able to participate in the effort to make glasses affordable for people in Africa and elsewhere. This is the reason why he only asks for a very marginal charge on each glass. He even purchased a special milling machine at his own expense to be able to produce glasses of an even better quality.
Mr. Zhang knows from his own experience what it means to be poor. When he was young he seldom had enough food to eat and was paid starvation wages. He is proud that he succeded in founding his own company and that today he can even support people in other countries.