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Just pointing out that Musk is not necessarily a 'billionaire' in actual net worth.

yet his [successful] endeavours look like of a billionaire

He is a billionaire these days. He owns 1/3 of Tesla, which has a market cap of $3 billion. His ownership stake in SpaceX is also without a doubt worth a nice chunk of change.

The key distinction between this and Virgin Galactic: orbital spaceflight!

That's definitely the most interesting part. A clone of SpaceShipOne, with a rocket done by SpaceX? Is there anything special about this company?

Mojave Aerospace Ventures developed SpaceShipOne. It was co-founded by Paul Allen.

Seems odd this wasn't mentioned in the article.

Very odd, as this is effectively SpaceShipThree.

Not a clone of SpaceShipOne, a new carrier aircraft that is a derivative of White Knight / White Knight 2 and a new rocket that is a close relative of the Falcon 9. The "special" part is that nobody has done that before, and it may prove to be a worthwhile endeavor.