I looked into this a little more, and it looks like those who are strongly tied to the LW community are less likely to give high answers to p(cryonics) (p>50%), but not any more or less likely to give low answers (p<10%). That reduction in high answers could be a sign of greater rationality - less affect heuristic driven irrational exuberance about the prospects for cryonics - or just more knowledge about the topic. But I'm surprised that there's no change in the frequency of low answers.

There is a similar pattern in the relationship between cryonics status and p(cryonics). Those who are signed up for cryonics don't give a higher p(cryonics) on average than those who are not signed up, but they are less likely to give a probability under 10%. The group with the highest average p(cryonics) is those who aren't signed up but are considering it, and that's the group that's most likely to give a probability over 50%.

Here are the results for p(cryonics) broken down by cryonics status, showing what percent of each group gave p(cryonics)<.1, what percent gave p(cryonics)>.5, and what the average p(cryonics) is for each group. (I'm expressing p(cryonics) here as probabilities from 0-1 because I think it's easier to follow that way, since I'm giving the percent of people in each group.)

Never thought about it / don't understand (n=26): 58% give p<.1, 8% give p>.5, mean p=.17
No, and not planning to (n=289): 60% give p<.1, 6% give p>.5, mean p=.14
No, but considering it (n=444): 38% give p < .1, 18% give p>.5, mean p=.27
Yes - signed up or just finishing up paperwork (n=36): 39% give p<.1, 8% give p>.5, mean p=.21
Overall: 47% give p<.1, 13% give p>.5, mean p=.22