This $27.8 billion dollar valuation tells me that somewhere along the line, my job and lifestyle have caused me to detach from a significant chunk of society. I've never used Snap or their platform. I don't even really know what the benefit of their service. I am curious if I'm in the minority or if there's lots of developers like me who aren't able to comprehend these valuations.
The only valuable currency of the information economy is human attention, and those who harvest it most efficiently tend to command higher prices while re-selling it to advertisers, who all vie for a piece of it.
In this sense Snap, Facebook, television networks, books, Netflix, newspapers, churches, 9gag, radio stations, PlayStation Network, billboards, blogs, professional sports leagues and magazines all compete for the same currency and those who accummulate the most get to name their price.