Before I became a coinner that was few years ago, I had that same thought why can't the billionaires of the world such as Elon Musk and the rest institutions invested on bitcoin just buy the whole of the bitcoins and hodl it in other to make profits in the future since the speculations goes around that bitcoin is volatile and it price will increase beyond the sky limit.
But that was all a dump head thinking. I failed to understand that when demands in the bitcoin market is high, the volatility pressure increases whereby, the price increases too which means it'd be too expensive or likely impossible for those folks to buy the whole of the 21 million provided bitcoins. Besides you can't be faster than the shadow because you can only buy what available bitcoin miners has mined.

Bitcoin is reserved assets which means when on fews people has it all or more, the profits they'll make will be very shallow. Which means the profits will be very poor and the strategic market plans in the ecosystem is viewed that when new buyers successfully buys a huge amount of bitcoin, the recent holders makes profits out of it. Getting this understood, when all the big buyers shares the bitcoins among them and no chances for others to buy after them, then the price will either Pegg on a resistance level or market price may permanently remain bearish since the market gains momentum to pump when there's new buyers.