According to your thinking, schools should also not be charging any fee for the summer vacation as there are no classes held during this period. Don't the drivers of the school buses need to get paid a salary for the months during school vacation? Put yourself in their position and then think. Also, if you check back home in your own country, you will learn that all bus drivers get paid during school vacations. What is your reasoning behind your worry that schools should not be charging school bus fee during summer vacations?