If course institutions and even top government officials are acquiring bitcoins, there are no restrictions against doing that, neither is there any compulsory law that it must be made public.
Most individuals choose to stay low-key and anonymous, I think there are many celebrities into this network, but because if fame, they stay under the radar.
I think when governments from various countries in the world can accept bitcoin and there is no limit to having or using bitcoin and bitcoin can be legalized its use will give effect to bitcoin price movements because it will be increasingly difficult to get bitcoin.