Many boaters know one another either by proximity or by type. ie:GF boaters tend to be together, as are many sailors, etc..
It would benefit all if there was some peer pressure within the groups. I know that if twenty GF boaters found another's actions objectionable, and voiced their opinions to that boater, it might have some weight in changing them. Maybe not. Same with all groups.
I found no noise objectionable on the lake this weekend, and there were plenty of GF boats around. BTW, Absolutely beautiful Outerlimits at the Naswa dock Saturday. I didn't have my camera
Speaking of noise, I noticed many PWC's that were pretty darn quiet. I don't follow them so I know nothing about their engines or exhaust. But I did see many of them, and most were pretty quiet. Nice trend.