They have already invested they are not dumb they are rich so they do not care about their money they have a lot money. I also think that they are gaining more money from bitcoin.
So they are getting richer and richer while we are fully focused on bitcoin.
Maybe they did already invest in bitcoin or other cryprocurrencies discreetly and we don't know they are the ones we all call "whales". And for sure they already know about bitcoin, Bill Gates even knows about bitcoin and he is one of the famous billionaire known worldwide.
I am pretty sure on this thing that billionaires do invest in bitcoin and are holding good amounts of it.Lets talk about the total amount of bitcoin. It was 21 million and then it is said that 2 to 3 million are lost and 1 million are in Satoshiss wallet. Now we only have somewhat 4 million bitcoin that are still to be mined out.
Subtracting 4 million from 18 million bitcoin which gives 14 million and now I can bet that people like me are not holding a lot of bitcoin. Using common sense, billionaire have great amounts of btc.