Which, IMHO, is pretty damn cool.
it isn't cool if everyone ostracizes you and your life sucks whilst you work to save everyone, and then afterwards you get no acknowledgment; at least not in my book, especially if the problem is so large that the incremental reduction in risk you can achieve is very very small.
But in reality, I think that there are third options, side benefits to being involved in the risk-reduction movement (the other people in the movement are nice and smart, which means that they are great to be friends with, and they influence you positively, it provides personal motivation beyond what you would normally have, and if you are good the incremental reduction in risk you can achieve is large enough that you make a substantial improvement to your own prospects), so actually I think that being a risk-reducer is a personal gain, at least the way the current situation is.
If the situation changed so that it was a heavy personal loss (e.g. you could maximally reduce risk by sacrificing your life or risking a serious probability of that for the cause) then I would want to heavily advocate incentivization in some form; otherwise, a lot of people will drop away from the movement (not necessarily me, though I would have to do some soul-searching).
Though they end up being small factors in my own considerations, I like the mention of the side benefits of being part of such a group.
I've been talking to a variety of people about this recently, and it was suggested that people (including myself) might benefit from a LessWrong discussion on the topic. I've been thinking about it on my own for a year, which took me through Neuroscience, Computer Science, and International Security Policy. I'm hoping and finding that through discussion, a much greater variety of options can be proposed and considered, and those with particular experience or observations can have others benefit from their knowledge. I've been very happy to find there are a number of people seriously working towards this already (still far fewer than we might need), and their deliberations and learning would be particularly valuable.
This is primarily about careers and other long term focused efforts (academic research and writing on the side, etc), not smaller incremental tools such as motivation and akrasia discussions. Where you should be applying your efforts, now how (much). Unless there's a lot of interest, it might also be good to otherwise avoid discussions on self-improvement in general and how to best realize these long term concerns, bringing those up elsewhere or in a seperate post.
A few initial thoughts: