Is Uber worth $18 billion? Hey, why not? But that doesn't matter. What matters is that a lot of smart people believe it's worth $18 billion and there are a lot of smart pundits and analysts will back up this belief too.
Antiquing is a fun way to spend an afternoon, but remember that the people who work in the industry are trying to earn a living. While it may be a leisure activity for shoppers, sellers and dealers are working hard. Don't waste their time.