I opened a buffet car washing lot at home, 5 car washing spaces, charged 6 yuan once, 600 seconds each time, the business is so explosive, and people come to wash in 24 hours.

I opened a self -service laundering in my house, 5 car washing spaces, charged 6 yuan once, 600 seconds each time, and the business was so explosive. Someone came to wash the car for 24 hours. Why isn't it rich? How could this be like this?