The thing with investors is you'd only know they invested in something after they've already made an exit or it can no longer be hidden. Which I think is one more reason to not take their word on what the hottest investment is.

I wouldn't be surprised if some in the banking sector already have a stash of bitcoins. At at least 10 years old bitcoin still haven't shown any sign of disappearing and that might raise confidence that it is an investment option to diversify into.