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I think "Professional Mathematics" goes further to dissuade as well as offers less of a target than "Professional Mathematicians", and is less flip than "In the Ivory Tower". There will be no stopping the cranks, and the incognoscenti might worry that there will be an attached fee. Maybe add "PayPal accepted".
Indeed. So when you make it, start using it. People will then get a good idea from the existing transcript if they want to contribute, but people are more likely to join/contribute if there is an existing room as well as a (non-meta) question and comment pointing to the room.
It might be more effective to just start a room, and inhabit it for a while. If one doesn't have enough reputation to start a room, answer or ask enough questions in that area until one does.
