when he invites you to get in on the ground floor of an amazing opportunity, I suggest you take him up on it. He's rich so it definitely won't be a scam!
My impression of him is that he's a decent guy who got targeted by scammers who knew he was rich. I've participated in the ground floor of plenty of opportunities. Some of them work out, some of them don't. But the ones that do more than make up for the ones that don't.