Summarizing your view, you require maximum awareness of your environment to fulfill your patroller responsibilities effectively. This is a valid point which can be supported with good examples as you & Catskills have both done.
I used to take a similar approach, leaving my helmet behind when working without an assistant coach, since I needed to be extra diligent when I had sole responsibility for my group of kids. I don't have that option anymore -- helmets are always required, with only a few exceptions allowed on closed race courses. I've had to make accommodations to ensure that the safety of my group is not compromised. Not unmanageable for me, but the accommodations I've made with my group of 10 or so kids wouldn't necessarily hold up for you. So, it looks like you've still got a good case.
You aren't trying to argue against intrinsic safety benefits of a helmet as far as I can tell. This helps your case too. If I read between the lines I can come to the conclusion that you're actually forgoing a small measure of your own personal safety in the interests of providing the best possible services to the skiing public.
To simplify even farther, helmets aren't necessary most of the time when I'm working and are a detriment much of the time.