Buffet was severely handicapped by the amount of money he had available. He mentioned that himself. If he had to manage only a smaller amount of money he would easily achieve 40% or more per year.
I doubt it makes people sad (well not me at least) because the buy in to get Citadel to invest for you is what 10? 50 million?
You could hit up juleiie from above for his/her winning method I suppose, or you put a portion of your savings into an appropriate ETF and get on with your life.