well people like Bill Gates tired of being rich and no need to invest in bitcoin, he might invest but only for tested not to earn profit. However we don't know if he trully invest in bitcoin, on the other hand the price would be skyrocket if he really invest his money in to the bitcoin.

and might be a disaster if he selling all of his coins. This is why i'm scared of, when rich people get in to the bitcoin, they such have control over the bitcoin.