Probably because of all the negativity.

I am being serious, when all you see and hear are people complaining and whining it wears you down, you ask yourself why am I bothering. Why do I waste my time when all people do is act like entitled assholes who don't even understand the concepts of please and thank you.

Case in point - this is the first time in ages I've ventured back into the Renderosity forums and I'm confronted with a veritable ocean of negative crap.

It'll probably be another six months before I forget why I eschewed these forums and have another look only to be reminded once again.