My interperetation of what people were suggesting with a members area was an area where you would have to have an account in order to read it. If I was correct in that interperetation then even people with 0 posts would be able to read it, but search engines and unregistered guests would not be able to read it. That really wouldn't protect you from much other than a person would at least have to give a valid email address in order to read it.
I personally have no need for such an area and have no complaints with things the way they are, but I do understand why some would have a desire to create safer space. But it seems like YGirl has the perfect answer to that with the multiple recipient PMs. Plenty of safe space there.