well i think they are, there is a rumor that Zuckerberg is investing in bitcoin. And hell yeah they know that it exist.
All billionaire an millionaire are all business minded.. They always keep on research what kind of business they have to build. So for me with regard the question above. I say...
Absolutely yes... Many billionaire an millionaire who are invest thier money in bitcoin...especially they already know that the stock market in bitcoin now is highly volatile...they already know the good future of the bitcoin is in the right track.so they think that the bitcoin is the big help for thier business especially they gain more profit..
There is a famous term Whales that is used here by many people and I am sure that word is used for referring to the big guys who make investment in millions and who are the real game changer. I am pretty much sure that if not at then some rich people do make investment in bitcoin. They will never ever miss an opportunity like this, especially when they can mold situations according to themselves.