I believe we are experiencing a Startup Valuation Bubble, evidenced by extreme purchases such as WhatsApp for $16 Billion (and instant messaging company), Oculus for $2 Billion (a research company with no product), SoundCloud, etc, etc etc.
While other companies like Satellite companies are selling in the hundreds of millions, not billions.
I don't think these gross over-valuations are sustainable.
These are all companies that a few years back, would have, at best, sold for a few hundred million.