SpaceX is expected to go public at one of the richest IPO valuations in market history, with retail investors set to receive unusual access through platforms like Robinhood and Charles Schwab. CNBC spoke with five retail traders and investors about why they requested SpaceX IPO shares despite concerns over valuation, volatility, Elon Musk, Starlink, AI infrastructure, launch services and whether public-market buyers could become exit liquidity for early investors.