I would look at more than just the profit part of the equation. OA is not a profitless endeavor regardless of who is the publisher – for profit or not for profit. I would think the most important part of the equation is what the faculty thinks. By instituting a tiered system based on “profit” one has to determine what profit means.
Also, any system that penalizes with whom to publish is a form of censorship and I would hate to think a librarian would be involved in that kind of activity.