SpaceX is coming to market on Friday, and investors can barely contain their excitement. The $75 billion stock offering is reportedly deeply over-subscribed , with some institutional investors ponying up for $10 billion blocks of Elon Musk’s empire. There are lots of reasons to be skeptical of the investment — big IPOs tend to sink, the company is losing money, and Musk’s erratic online behavior would be terrifying coming from any other tech CEO — but it doesn’t seem to be slowing anyone down.