It's sort of amusing to me that the evaporative cooling mechanism (though not under that name) was actually proposed by Russel Hardin well before EY got to it.
The amusing part is the proposal is in a book presenting the case that rational choice theory actually explains a lot of apparently irrational behavior, which is, ahem, not exactly the modal viewpoint on Lesswrong.
Background info: a splinter group, which broke off from the LDS ("Mormon") church ~100 years ago, refusing to give up polygamy, has been in the headlines over the last year; their leader was sentenced to life in prison for rape of teenage girls he took as plural wives.
And apparently the rape wasn't even just statuary. It also had other people present. Creepy. (Incidentally, 12 is preteen!)
According to numerous critics and outside observers, the imprisoned FLDS leader has sometimes acted through his brother Lyle and other times has spoken directly to his congregation over the phone from prison. He recently banned many of the things his followers enjoy: bicycles, ATVs, trampolines, even children's toys. But the sex edict reaches into the bedrooms of all his devoted followers.
That really seems like a self sabotaging religious doctrine! I'm surprised that the number leaving is so low!
That sort of thing happens.
My usual interpretation is that most users don't read more than a fraction of the threads, and there's a wide readership variance between threads, so a mildly interesting comment on a popular thread will get more upvotes than a very interesting comment on an unpopular thread. The karma score of all the comments in that thread encourages that interpretation.
More generally, I think you'll do better to consider it evidence against the theory that karma actually measures anything particularly well, than to consider it evidence towards a theory that there's some particular thing that comment particularly well exemplifies which LW users particularly want to see more of.
Background info: a splinter group, which broke off from the LDS ("Mormon") church ~100 years ago, refusing to give up polygamy, has been in the headlines over the last year; their leader was sentenced to life in prison for rape of teenage girls he took as plural wives.
Deseret News, Sex banned until Warren Jeffs' prison walls crumble, FLDS relatives say
Eliezer, Evaporative Cooling of Group Beliefs
This doesn't simply seem to be a case of a new weighted average after some skeptics are gone (only 1% of FLDS have left). There are other dynamics going on among those remaining.
The image that comes to my mind is a lot of points scattered along a skepticism/fanaticism axis, and a repelling magnet placed on that line. This magnet pushes the already-skeptical values into greater skepticism (and out) and pushing the more fanatical members into greater fanaticism. How well does that actually represent what's going on? Not sure.