Estimation beats market cap when it comes to the sustainable value, which only comes from hard-earned cash, not crazy bomb-passing games you can observe in ever

Estimation beats market cap when it comes to the sustainable value, which only comes from hard-earned cash, not crazy bomb-passing games you can observe in every bubble scene. I do think that FB can be traded around $50 billion and may be $500 billion (Who cares? Most of investors-speculators don't care about its paper worth on the market.) if another dot-com bubble forms. However, what would be its sustainable value? How will it generate its profit to justify its valuation? Until it's on its verified earnings statement, it's just another bomb-passing game. Who really care whether it's $5 billion, or $500 billion, if one believes he can pass his bomb to the enthusiastic guy beside him?