As someone who has only recently joined, I would hope you'd keep it open - with limitations (SO's model doesn't bother me, and I'm on other boards with similar reputation-based permissions). My background is programming, not UX, so I look to resources like DN for good, solid information. If you close DN to others like myself, you cut us off from the opportunity of learning, and the of the possibility that we can, at some point, contribute of our own strengths. And, by the way, I do have a business, and a product - but I'm not here to push it at you. You won't get spam from me.