Back in the day, I raced dirt bikes. (Enduros and Hare Scrambles) One of my sponsors was a bike shop near here. The owner had a sign made up to promote sales of higher end helmets. It pretty much summed up my thoughts on wearing helemts on a motorcycle.
"If you have a $20 brain, wear a $20 helmet"
"If you have a $500 brain, wear a $500 helmet"
"If you have NO brain, wear NO helmet"
Not sure what this means, but I wore a $300 helemt with a $500 paint job.....
A group of us formed a club, leased a farm, and held AMA sanctioned Hare Scrambles. We had a rule that was strictly enforced. If you were caught so much as just sitting on a running bike while NOT wearing a helmet, you were banned from the property. Anything less than that would have been a proverbial shot in the foot to the image of the sport.