SpaceX (SPCX) is doing more than launching rockets. It is building a satellite internet empire, expanding into wireless communications, and investing heavily in artificial intelligence (AI). But even with those ambitions, profitability remains a concern. SPCX stock has erased its IPO gains, down 6% since it started trading in June. Cathie Wood’s latest $9.4 million sale of SpaceX stock adds another reason for investors to pause before rushing in.