Here's my .02, not that it matters to anyone else:
If you ride a motorcycle, you know the inherent danger presented to you. Therefore you should be able to chose if you want to wear a helmet or not. I, for one, value my head and my face. it may not be the prettiest or the smartest one out there, but it's mine. I'll take care of it by wearing a helmet, and a full face one at that. I know I stand a better chance of survival and not being a vegetable or looking like Sloth from The Goonies should I crash.
It should also be said that by signing the title or whatever for your motorcycle that you acknowledge said inherent risks and should you decide to not wear any protective gear, that you assume all liable risk and injury. And if you take a header (pun intended) that you're responsible for yourself and whatever medical issues arise from your own doings. Don't live off of my paycheck, there are already enough wastes of space doing that.
Again..this is my opinion, and mine only.