Ehhh yes, thats actually a simple answer some don't and some do, but i think that most of them already have invested. They are smart people and have a lot of money so why don't they risk a little bit of money for investing in bitcoin ? They can and have the money i would just risk a little bit of money in investing, because its not worth anything if i had a lot of money.
So these investments are actually nothing worth to them. If they gain money they just invest again.