I don't know what to say about this because as a lifelong value investor I cannot accept the valuation of Uber based on it's earnings. But the same logic held me back from investing in Facebook and Google, which did not make any sense to me at the moment of their IPO. How do I decide what Uber's earnings will be in five years?
Warren Buffett's advice on this is simple. If he doesn't understand it, he doesn't invest. No matter what the rest of the world thinks. He famously missed the dot com boom. And in the middle of it, gave a private speech about exactly why, about how few of those companies were likely to be around in a few years even if the internet were exactly as successful as hoped for. He was widely derided as being behind the time…
I don't think he regrets his conservatism. From 1990 through now, BRK.A is up 4,200%, while the NASDAQ composite is up only 1,500%.