Probably you do no know a shit about how bitcoin works. You can not just buy as much as you want just by your own, you can not modify the price just because you are "billionaire"
If I was a billionaire banker I would try to buy a shit ton of BTC before CME, create FOMO.
you need to move more than 10 billion dollars from the bitcoin marketcap to move the price by just $250 aproximately.
And seriously, would you put all your money in here just because you believe in it?
Then you could be a poor billionaire of course, how many billionaires have you seen investing "billions" just like you said in here? I haven't seen one.