I am sure that I have at least a bit of hearing loss from wind roar. I have used ear plugs for almost my entire riding career, but not the first year or so when I was inexperienced.
Also, I wonder about the cumulative effect of wind roar even with ear plugs; it's not like they completely silence it.
"You wouldn't be riding a motorcycle if you weren't an optimist."
- Matthew Crawford
2005 Ural Tourist, 2000 Kawasaki W650