"doesn't look so noticeable" who cares its your melon. I remember when I started Snowboarding, I wore a helmet (still wear one when I go boarding). you barely saw helmets on the ski hill because they were not "cool" today almost everyone wears a helmet no matter what they look like because people realize your head is worth protecting.
Who cares what the protective helmets for pitcher look like, if it protects your head from 100 mph ball then I think it should be worn.