It takes some guts to put up an image and get some decent CC, which is why we see a lot join AP then not stay.
Those that do stay and take the CC on board (remembering CC maybe wrong, its just another opinion, but it helps your thinking) do improve their skills!
I'm off to do my first camera club judging at the end of the month, (I did the SAPF juding course late last year).
I'm expecting that about 1/2 the members of that club probably won't like my comment or score (normal)
- but club judging is anther form of CC and that's how we learn.