Well....
I am developing very mild tinnitus, and it's not from work or concerts.
It's either from motorcycling air noise or from airsoft pyro.
I almost always wear (and have almost always worn) earplugs when setting out to ride at over 40mph. Still, it could be that.
Or it could be pyro. I don't wear ear protection in airsoft, but I'm coming round to think that I should.
Personally I think that a .209 primer or Mk3 is sufficient indoors. If folk don't hear and take those, they're unlikely to take a 9mm or Mk5 either. That's earball overkill.
And 9mm or Mk5 is all you need outdoors.
Even then, a 130dB-at-1-inch Mk5 going off right by your ear outdoors will do just as much irreversible damage as if it goes off indoors.
I will now tune back in to my scheduled "eeeeeeeeee" sound.