So all else equal, I would expect that a forum devoted to effective altruism will tolerate uninformed posts better than a forum devoted to rationality would, because EAs want to spread effective altruism and one way of doing that is to educate people about it. I've previously hypothesized that LW has suffered from overly heavy-handed moderation that's stifled people from posting content... it seems like trying to have a culture of encouraging contributions could be useful here (even going so far as to disable the downvote button for the first few months after launch?)

Another idea is to target specific effective altruists who aren't already terrifically busy and ask them to write blog posts; I suspect some would be honored to be so asked and would take you up on the offer?