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.