[tomjen3]

In (elementry) school I had the habit of saying good morning when I showed up - pretty basic and I didn't think anybody particularily cared, until my mom told me that the teacher had been told by one of the parents how much that simple good morning meant for their child.

So yeah, simple curtesy matters -- that said I don't think I would be that happy if every stranger were saying hello to me on the street; it would quickly become overwelling.