I've thought about this a bit. While I want the site to be a resource, I suspect that letting it be indexed by search engines is more likely to bring trouble (journalists looking for an easy article publish; evangelists show up) than it will benefit the site via new members.
I've likened the situation to being like that of the Underground Railroad. We are all seeking our own peculiar form of liberation in a society which seeks to keep us chained to this life ... for our own good, naturally. I suspect a little more secrecy is called for. We are defectors seeking escape, after all.