What makes a great SnG player?

What is it that makes a SnG player great? There are several world-class SnG players that have grown beyond this forum: Curtains, Gigabet, the Gigabet brethren, etc. There is obviously a vast ocean of knowledget that exists beyond these boards and the great players have discovered and exploited that knowledge.

Personally, I wonder if this board doesn't hinder SnG development. Mostly, there are posts by small-limit players and then a bunch of social posts. Very few substantive hands are discussed anymore. I don't believe that the best players were run off by trolls. Rather, they were run off by the lack of substantive content and the "good ol' boys" flavor of the board.