Gosh!
Why does every DO have to end up in some argument?
IMO as an outsider of this DO, I think if a DO is going to publicly advertised, there should not be any exemptions in regards to, whom is not invited. If one feels that he doesn't want to join such a large DO, or a mixed one, or there is to many n00bs going, he can simply not join.
However if Dan or whoever wants to make a private DO, with whatever stipulations which they want. I think the proper way would be via inviting through PM.
Like this we can avoid any hard feelings.
#justmy2cents