Elon Musk and Grimes just welcomed their baby boy. Here's how the eccentric CEO makes and spends his $38.2 billion fortune.

· *The **Tesla and SpaceX* CEO Elon Musk and Canadian recording artist Grimes welcomed a baby boy on Monday night. Musk tweeted that they'd named the baby "X Æ A-12."
· Despite having a lot of mouths to feed, *Musk **won't receive any form of payment** or compensation from Tesla until the electric automaker reaches a $100...