i think you are missing the human element. money does not buy happiness. to get that fulfillment, he spreads his knowledge to those who are open minded. there is no greater feeling than helping your fellow humans succeed.
sqying you would not have time for anything else is bunk. why keep it going so much when you have a comfortable size bankroll? wouldn't you want a hobby (golf, swimming, flying...)
the FLD were/are a conceptual experiment (havent you ever wondered what would happen if all the stock for a company was bought and held?)
your opinion is just that...unless you have learned it and put it to the test you'll have no way of knowing.