Don't forget that hacker news has collected lots of media attention all those numerous time that Y Combinator is mentioned. Paul Graham even pointed out to the community here that the demographic would be changing, and perhaps it has again a few times over.

The recent http://paulgraham.com/fundraising.html is worth mentioning because if the VC types appear in droves here to observe us, they indirectly create a salting effect where we stop posting or otherwise behaving as ourselves. i.e, we go elsewhere, possibly back to a chat room, or just keep to ourselves until another collaborative opportunity presents itself.