Couldn't agree more. As RAF I'm not bothered about inverted spinning at 18000ft, but the wife changes the lightbulbs at home. Asked a mate (psychologist), and got an answer that makes sense to me. He reckons that people who are afraid of heights are not actually afraid of being high up, but are afraid of falling. In an aircraft, you're sitting in' and are probably well fastened to, a chair. Your brain knows that you won't fall out, so you ain't scared.