How I recently explained bogleheads theory to “trader“ friend

I used this analogy: The average man in the US is 5’9”. If you could roll a pair of magic dice that would make you either 2 inches shorter, or 2 inches taller, would you roll the dice, or be content with being average? (he’s actually 5’9”) He gave it some thought, then he said “no”. And I said “yet you fiddle with your investments every day, which is the same as rolling the dice for a chance to be better than average”. He said “that’s different“, but is it? I sanitized the analogy for this post, but it was actually an anatomical feature.