Dont think average is an issue after the new changes,bad games dont have an impact on your average score.
Personally,i would think people quit out of frustration.
Just playing the oakmont full 18 .Was 3 under par at front 9 and on back the usual,bogey after bogey.The game become so annoying to play with meter stutters and crazy winds,have to quit on 14 after an uncalled for double bogey.
I have seen many people here objecting about not playing much on oakmont.I have yet to complete a match there when i dont face meter stutters and unrealistic winds every second hole.I dont find the course much difficult but the playing conditions there are absurd.