Think about an Oil rig, if you will. Just because it takes half a billion dollars to get it started doesn't mean it is barely eking out a profit while it's being built. Once it's built, its going to make the owners billions.
I think a comparison to an oil rig is wishful thinking, to say the least. You have a basically clear and proven business model that's existed for 100 years, based on selling a tangible product that everybody inarguably needs.
Facebook has none of those characteristics, and nobody's proven that there's anything substantial where they're digging.
