Something don't add-up

Going back to the number of millionaires we have on Earth - circa 20 millions, the currently available number of BTC circa 15 millions, and seeing the amount of media coverage, institutional adoption and endorsements we are enjoying at the moment...I mean why so many millionaires haven't purchased yes 1 Bitcoin? Are they so short-sighted, cautious or what? I mean what it take for a millionaire to unlock 30k to buy 1? Any thoughts on some people's mentalities because I'm struggling to understand why are so many people asleep. If you recognised yourselves in this post, would be highly appreciate if you could share your reasons dear millionaire friend :-)