An average, what is the biggest leak for above average players?

[brick]

I suppose good players don't play too many hands.
Or play too passively post-flop.

FPS?
Call Down Syndrom?
Making Big Folds?

[bernie]

Playing too many hands. Many seem to hit a level where they think they can play more hands because they overestimate their edge/abilities.

This is mentioned in the essay about 'stages of a poker player'.

b