There's an issue related to the Singularity Summits that is tangential but worth mentioning: Even if one assigns a very low probability to a Singularity-type event occurring the summits are still doing a very good job getting interesting ideas about technology and their possible impact on the world out their and promoting a lot of interdisciplinary thinking that might not occur otherwise. I was also under the impression that the Summits were revenue negative, and even given that I would have argued that they are productive enough to be a good thing.