"Each question will at least be held at 2 to 1 odds amongst professional philosophers, i.e., if more than 2/3s of professional philosophers agree, we won't bother. So as to not waste our time with small fish."

This is cheating, of course. You are comparing group A to group B on questions specifically selected for their difficulty to group B. Instead, it would be more fair to find open problems in fields that haven't received much attention from professional academic philosophers.