SpaceX employees have to wait to sell their shares, but many are already planning how to spend their windfalls.

"There's this meme that wives of tech billionaires go on to do NGOs and fund bad causes—SpaceX will be the literal opposite."

SpaceX's IPO could value the company at $1.8 trillion, raise $75 billion, and create 4,000 new millionaires including cafeteria workers with stock options.