I think a certan number of us feel drawn to this forum (the Poetic Haven in particular) because of the intimacy level, the senior-members-only atmosphere (which seems to ensure an overall better response to one's poetry), and the lack of any risk of something plummeting beneath page 1.
Plus people periodically check into the Haven and toss around a few replies, so it's good if you don't mind leaving a poem to linger and gather responses over a longer period of time... especially when those responses are almost guaranteed to be more than "Lovely" or "I like it."
Not that there's anything wrong with Open... I just prefer the intimacy of the Sanctuary myself.
As for Family Dialogue... well, it's useful if you don't want to start another Cheese Joke thread...
"God becomes as we are that we may be as he is." ~William Blake