There is very little consideration lately of other people. My time is not less important than your time, just because I am the seller or not in your inner circle it does not make me less important.
Case in point, I received a call from my realitor Tuesday afternoon to show the house on Wednesday at 11am to 12pm. No problem, we were able to straighten up and get the house in showing condition. Well 11am Wednesday came and I was ready to let the potential buyer and agent in as I waited an hour no body showed. At 12:05pm I called my realitor and he informed me that they called him not 5 minites before I called him to cancel. The other party NEW before the appointment that they were not going to show.
My simple rule of thumbs are:
1. Be on time
2. If you are going to be late ... call the person you are to meet to inform them
3. If you need to cancel the appointment or meeting ... call the person BEFORE the time.