Does a bazaar need coordination?

Open Source Commnities are our references. The way they operate and perform, as well as how they are organised is admirable.
Self organisation, as happiness is something we pursue as global aim. But in the while, do we need to coordinate our efforts? Do we need an structure?

I would like to say no, but I guess reality and experience makes me recommend at least a minimum structure. I guess a good team could be integrated by: an artist, a media man, a techie and a business man. Who manages? Of course a woman ;-)