I am looking for some advice/insight on why (if at all) you should have "registration" on a WordPress Blog? Currently I have it that users need to be registered and logged in to comment and apart from the reduction in potential spam what does/would a registered user get which, if the restriction was not on, a normal commenter would not?
i.e. can we restrict some posts or entice users to read more etc only of they are registered.
Hope this makes sense. I am just trying to ascertain "why" or "what" a registered user gets for their opt-in