1.
Manias follow a pattern. Early adopters get rich, late adopters fund their exits, then the crash comes when you run out of buyers.
2.
Scarcity without utility is speculation. No cash flow, no intrinsic value — just hoping someone pays more than you did.
3.
Sell picks and shovels, not gold. Levi's got rich making pants for miners who went broke chasing the rush.