SpaceX employees going to work on the day of their company's IPO.Mike Blake/REUTERSThis post originally appeared in the Business Insider Today newsletter.You can sign up for Business Insider's daily newsletter here.Looking into your peers' pockets is a bad habit. But good luck telling Blue Origin employees that.For most of us, SpaceX's eye-popping IPO showed us investors' eagerness to back Elon Musk and his space and AI ambitions. For employees …