Grant85
Head Pro
If you are the sort of person who keeps a note of their last 20, what falls off and what it is replaced by and your best 8 you would know if the score you just had is likely to affect the calculation.
From what I hear listening to podcasts and picking up on the golf culture in the US, a lot of people do this. They know their 20th score that's dropping off (if it's a counter or not) they know the highest score that's counting towards their average.
Obviously golf culture is different there as there is much less in the way of club and competition golf. So most weekly golfers are simply playing against themselves every week to try and get their handicap down.