Citation does not support claim - article is about how only die-hard fanatics remain in a group when something diminishes its leader's reputation, not how trolling benefits communities.
I'd just like to point out that "But it's in 240p!" wasn't entirely serious. I transcribed it because I thought it was a really good answer to the question and more people would see it that way, and I'd gain some karma a Less Wrong to boot.
Relevant link, a post of his: http://www.aaronsw.com/weblog/stepback