Impressing (or at least not disappointing) PG was definitely a big incentive early on, and it lingers to a degree. I think, though, that PG's role in that has

Impressing (or at least not disappointing) PG was definitely a big incentive early on, and it lingers to a degree. I think, though, that PG's role in that has been replaced by the community at large. People are civil and thoughtful because they want to live up to the community. (Incidentally, I think in communities where people are jerks, it's also because they think that's what the community expects.)