Volunteer or Employee?!?!?!?

~As a volunteer photographer at various schools, it makes me wonder why their is always one individual on a Booster Club who thinks I am their employee. I  refuse to put my time in for any complaining parent, but I will do what I do as a volunteer for the recipients of the organization,as I have been for the past 10+ years. In this case, I volunteer for the youth of tomorrow and they are my only concern. "What I have to offer is all I have to offer and so that is where I excel as a professional"