The official numbers are out for SpaceX's IPO : Elon Musk's rocket and satellite company is aiming to raise $75 billion when it comes to market later this week, putting its valuation at $1.75 trillion . It'll be the largest IPO ever, and it's certainly in the running for the most-hyped listing of all time. But that type of anticipation is a double-edged sword. Soaring investor excitement can turn into volatility to chase the hype and cash in early gains. There's also the question of a historic