> There is no metric by which Whatsapp is worth 19B, except for the fact that Facebook can spend that much money. But isn't that the most important metric? I

> There is no metric by which Whatsapp is worth 19B, except for the fact that Facebook can spend that much money. But isn't that the most important metric? I would argue there is also no metric by which a Coach purse is worth thousands of dollars but people seem to keep buying them.