Even if the rich know about it, I think they would perceive it as some sort of speculative investment.
Makes sense. If we look at how the elite mostly is setting up their portfolio, they usually only allocate 1 to max 2% of it to speculative assets. They aren't keen on too much speculative exposure, which is understandable.
Not everyone is as biased towards Bitcoin and crypto in general as we are. I can happily put the major part of my wealth in Bitcoin if I think it has reached a price low enough, which others would call me crazy for.
As always the first get the most out of everything that's emerging, where later on if the potential is still there conservative gains is all that you can expect. Not good enough for speculators here, enough for the elite.