"Unless you have incredible investing skill, it is impossible to average 30% a year for 30 years"
Unless you're dumber than dirt it would have to be incredible/impossible to retain 30% for 30 years in a "LEGIT" manner. I doubt Soros has ever done anything in a "legit" manner. Most people like him don't. Generally cr*p floats to the top.
I don't follow how being dumber than dirt will increase your investing performance.