I would say that it does depend on the author's style though in terms of how much they WANT to make it a team effort. I can see authors reacting quite negatively to be saddled with a team of people they'd have to talk to throughout thewhole process when they just want to write that thing.

That said I do think it'd be grand if at least artist and author had a bit of a stronger bond than a here's the story - here's the art - end of communication but that's, again, probably personality-dependent and I'd say there are probably people who want only that out of of this.