I want to know what sort of people they want to attract.

My answers: smart people, people who already have a strong technical background in something, people who already have a strong interest in rationality.

Whether we do a good job of marketing this site or not, we could one day find ourselves so overrun with new users such that the old users are out numbered. That could happen so fast that the entire place seems to change in just a few months - that's how the exponential curve at another forum was experienced.

This sounds like a good problem to have to me. If we later decide we don't like it, it should be easy to just change the about page back to the way it was before.

There seem to be a lot of lurkers on LW, so a surge of new lurkers might be more likely than a surge of new contributors, with lurkers gradually moving to contributor status.

Maybe a new thread should be made "Who do you want to meet? Choose a target audience." - Do you want to do this one or should I?

IMO it isn't worth a new post, for the time being at least.

I am asking because I don't want to step on your toes - and there might be questions about the culture that only an older member would think to ask. Not sure.

I think the principle of be bold applies to this sort of collaborative writing process. In other words, throw something at us and we'll give you feedback on it.