These clubs make their money in varying ways. The one in the poster above charges
3800 yen for 40 mins where apparently you get to drink as much as you want. They charge
3000 yen for every extra 20 mins you spend in the place and if there is a particular girl who you want to look after you then you pay an extra
3000 yen. They also charge 15% tax when the national tax rate is only 5%.