Sure they do, it's not a secret. I don't think for them it's a priority, but still do it.
Absolutely, they are sure to see the investment opportunity in bitcoin like Mike Novogratz that said he has about 10% in bitcoin.
Yep! they always see this as a great oppurtunity for them to invest their money in new things. They are billionaires and they are not afraid to invest in bitcoin because they know that they got nothing to lose and even if they lose their investment, it is okay for them because they have a lot of spare money and they have other source of income.