It's not a bubble, it's a pyramid scheme
Those that got in first have the most coins, and all the (rich) idiots that came in later are just there to position themselves to cash in on the craze.
Not a single one of those billionnaires "believe" in funny money. What they believe in is the same thing as those scams hyping penny stocks : push many people to buy, the price goes up, you make out like a bandit.
Bitcoin has reached dizzying heights of value because of all the billionnaires throwing money at it and thus validating it in the eyes of Joe Schmuck.
Joe Schmuck needs to realize one thing : transfer fees are currently at $13.44.
So, that Pizza Hut pepperoni pizza you buy for fifteen bucks ? You can almost double the cost when you pay with funny money - if Pizza Hut takes it.
So, you tell me how great BitCoin is now.
I pay with VISA. If the cost is fifteen bucks, I'm charged fifteen bucks.
For that, I don't mind working with The Man.