So amazon's market cap of 144b is theoretical because they don't have profits? And bezos should be paid enough salary to survive but not so much that he is no longer "hungry"?
Second, there's no valid comparison between the A-round valuation of a startup and Amazon, a giant publicly traded company with a decades-long track record and huge cash flows. Mutual and pension fund managers invest in Amazon. To a first approximation, none of those managers directly value startups.