This seems like a good balance between 'closed to outsiders' (which we don't like) and 'completely open to anyone with an email' (which SE doesn't like)
Gotta know enough to have seen that pinned message. Pretty good barrier to entry.
@Undo I hate newlines too! Fun fact: Rubys built in ERB implimentation automagically inserts newlines at the end of everything it compiles and I just wasted 30 minutes figuring that out.