You are misreading. Basically the article provides the following market ranges for major cities:
Dates: 10,000-20,000 without sex, 20,000-50,000 with sex
Monthly: 50,000-300,000 without sex, 100,000-500,000 with sex
So 500,000 (50 man) a month is about the max a girl can get from one guy in...