Why would a doctor get mad because we no longer came to appointments anymore?

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My son went to the dentist in February. And the receptionist asked me when we would be moving to another city. I told her in July of this year. It seemed like his dentist got mad about this. When it was time for my son to be seen in the room. He was telling the dentist that he wanted me to come in the examination room to watch him get his teeth cleaned, the dentist told him, let mommy stay in there with your sisters. She told him that he was a big boy. Any other time, this dentist had no problem with me coming in the examination room. I was wondering about her attitude. I believe that she got mad because she found out that we would be moving to another city. But, my son will still have her as his dentist, that will never change. She must have thought that she would lose my son as her patient. But that was not the case here. I told the receptionist that we still would travel from our new location to this dentist office. He only goes here every six months anyway. The next story is about my Chiropractic. I had to go his office last week to pick my medical records up, and his wife, which was the receptionist was talking to me. And, the doctor was just finsished seeing a patient. So, he was wrapping up a conversation and telling him that he hopes that he feels better and that for him to have a great weekend. The doctor sees me and he did not even speak. The last time that I went to this doctor was in December of 2008. My doctor visits ran out. I am only allowed to have 12 visits per year. My insurance will only cover this time length. Anything after that, I would have to pay out of my pocket. The receptionist said that I would have to pay up to $30.00, I believe. I got the feeling that my doctor was mad at me because I no longer have appointments with him. I understand that they are about making money. They are not losing us as patients, why can't they see that? Now, if I came into the office and said that I no longer want him/her to treat me, then it is a problem then! If I am still their patient, why the attitude? Why do doctors do this? Have you had a similar experience, please share. Thanks!