If you dramatically outperform your handicap it's generally presumed that you have been "sandbagging" which is a form of cheating.
Yes, I understand that of course. But if the handicap is based on the four previous high scores someone would have to intentionally shoot poorly for at least four matches to set up the high handicap, then start shooting well to "cash in" (which would then lower their handicap because the higher scores would substitute for some of the sandbagging low scores). Doesn't seem to make sense. And, in the example I provided, someone with an honest 270 average would be penalized for shooting a 281, which is something that happens every day in every Bullseye league I've ever been involved with.