I don't know, VC is all about high-risk/high-reward, but there are differences of degree. A rocket company is rather higher risk and lower reward than the typical VC fodder.

Even if it was VC worthy, throwing all your money into two companies like that, when you're already rich, is not the sort of thing you'd see from someone motivated by money. The whole point of VC investing is to invest a little money in a lot of them to even out the risk.