Too many

My client took me to an automobile museum as I told you yesterday. When we entered the museum there was a reception counter. A young, pretty receptionist girl greeted us with an extreme politeness and cheer. She explained to us the qualification to get the advantage of discount tickets, none of which applied to us. So my client bought two normal tickets from her. It was good. But strange thing is another girl wearing a big smile was standing beside the receptionist waiting on us. As we left the counter she led us 5 m and passed us to another pretty girl with even bigger smile, saying "onegaishimasu." Then the girl who received us checked our tickets and told us where we should start the tour. At the starting point 10 m away, there was another girl standing in front of TOYODA model AA (see picture; please note that it was not called TOYOTA) , the first mass produced model in Japan. She suggested that we should walk anticlockwise to look around. I wondered if she was standing there only to instruct us the way to look around. I asked her a technical question. "Is Toyota the first auto maker in Japan?" "Unfortunately, no. Nissan first made a car in Japan in 19xx and three years later, Toyota made its first car." I wondered why "unfortunately", but anyway I knew she was standing to answer questions from ignorant people like me. But question for me is why 4 girls are needed for us to start the tour. There were only four people including us looking around in the museum. But there were about 5 girls (besides the four around the entrance) inside the museum just standing and waiting for us four people to ask questions. Admission was \1,000 per person. Why don't they reduce the number of girls and cut down the admission?
A few years ago I showed around an American guy in Tokyo and took him to Tokyo Metropolitan office building in Shinjuku on the top of which we can have the great view of Tokyo. There was a girl in front of the elevator just to bow her welcome. Then the elevator came. Inside it was another girl just to welcome and press the button to the top floor. When we got out of the elevator, another girl welcomed us. The guy was very happy to see so many young girls welcome him but he wondered and asked me "what are the girls doing actually?" I said "They try to show you inefficiency of Japanese municipal government." He burst out laughing.