I understand your point.
Yes, I have quit while ahead. Many times.
Last time, about six months ago, with a 50 round group with my HK P7....I did great....the planets were aligned.....and.... I took the target down and (while I wanted to frame it and put in my living room), I put a thumb tack thru it and display it in an inconspicious place in my shop.
Meanwhile, back at the range, and after the HK, I switch to a different gun and got my usual not-bad but good-enough results. But still....after the HK....it was a great day simply to be alive.
So I understand your point, don't I?
Back to your point. The posted target in the shop reminds me of the shooter that I CAN be, that I am capable of, that I can do again....and maybe even again.....after all, I don't believe that there is such a thing as dumb luck.