Which works :-) But I'm quite interested to know about the experience of those who read MoR, looked at LessWrong and went away never to return. I don't know if they can even be estimated, let alone counted, surveyed and analysed, but I suspect they're important - look at the evidence that would refute your hypothesis (in this case, that MoR is good for LW), not just that which confirms it.
I haven't hypothesized that MoR is good for LW. I haven't bothered to track the contributions of the people who arrived from MoR, so I don't have much of a sense of what they're bringing to the community. I'm just aware that there seem to be a considerable number of members who've come here through MoR.
I would be very surprised though, if more karma-positive members are leaving Less Wrong due to MoR than are arriving because of it.
I was recently thinking about the possibility that someone with a lot of influence might at some point try to damage LessWrong and the SIAI and what preemptive measures one could take to counter it.
If you believe that the SIAI does the most important work in the universe and if you believe that LessWrong serves the purpose of educating people to become more rational and subsequently understand the importance of trying to mitigate risks from AI, then you should care about public relations, you should try to communicate your honesty and well-intentioned motives as effectively as possible.
Public relations are very important because a good reputation is necessary to do the following:
An attack scenario
First one has to identify characteristics that could potentially be used to cast a damaging light on this community. Here the most obvious possibility seems to be to portray the SIAI, together with LessWrong, as a cult.
After some superficial examination an outsider might conclude the following about this community:
Most of this might sound wrong to the well-read LessWrong reader. But how would those points be received by mediocre rationalists who don't know what you know, especially if eloquently summarized by a famous and respected person?
Preemptive measures
How one might counter such conclusions:
So what do you think needs improvement and what would you do about it?