"My point about Bitcoin is why not just buy metal?"
Because that would mean you know that "nothing" isn't "something" and recognize that "nothing" is a poor way to store of value.
A pyramid scam always starts with nothing of value and a conman, followed by a long parade of suckers thinking they're going to turn nothing into something.
At least it's better than gambling. Showmanship counts. Just tell people they don't understand and they're being paranoid. Tell them it's the wave of the future and enormous profits await. With enough showmanship, you can get them to buy in and become showman themselves because that's where the profit comes from, a steady supply of suckers.
P.T Barnum: "There's a sucker born every minute."