No wonder there is an old Taiwanese saying describing the most profitable professions which goes: "First, become a doctor; second, sell bing; third, open a brothel."
無怪乎，台語有句俗諺：「第一做醫生，第二賣冰，第三開查某間（妓女戶）。」道出往日台灣社會最賺錢的三個行業。