I'd throw out the theory that the hardest thing about learning to fly is making the money to pay for lessons. Making money is directly related to IQ. So only 'clever' (and that is a very poor way to describe people with higher IQ) people learn to fly
Nah. Flying is no more expensive than golf, and anyone who wears Rupert trousers and *those* sweaters....... ;~)))
Seriously, I believ that people who make lots of money are not usually the most intelligent, but they are reasonably so.
But I don't beleive you have to be particularly wealthy to fly - I'm certainly not, and neither are most other flyers I know. It helps not to be poor, but wealthy? No.
SSD