You'll note that these guys always talk about tulips. At the same time they always ignore what might be considered irrational market behavior for ultra-rich hobbies like art collection of multi-million dollar pieces, at insane values...

http://money.cnn.com/2016/02/19/luxury/ken-griffin-david-geffen-de-kooning-jackson-pollock/index.html

300 mn USD painting...

https://en.wikipedia.org/wiki/L%27Homme_au_doigt

140 mn USD sculpture...

You add a few of those and you are in the tens of billions range. But no, that's not tulips, that's art "deserving" billions. Right.