I counter that audiophiles who listen at 85 db or less for serious listening can't or are unable to listen at higher volumes do to enviroment circumstances. I have no such problem, and have yet to meet a audiophile in my neck of the woods so I don't know what normal would be, perhaps I'm a fanatic.
Do you think anybody has actually done a test on whether 'music' played on a 'hi-fi'system between 85-100 db 'c' weighted does equal damage to every day sounds of equivolent levels? No, who would volunteer, and all doctors want to appear credible on a subject they have no information on.
As for listening fatigue, I experienced this approx. 2 years ago. But am no longer bothered by it unless I'm tired to begin a session. And can therefore listen for up to 8 hours at time without feeling strain. And if one is hearing room interactions at these volumes than you have acoustic problems.
I am not saying I am not damaging my ears, time will tell but I don't believe I am at these levels with my system. With music being as subjective as it and no two people having the same listening conditions. Then it would be prudent to follow decibel guidlines.