The Space Exploration Technologies (NASDAQ:SPCX) share price has pulled off something like SpaceX's 25 July test flight. Watch the business, not the stockWhile the SpaceX stock has been volatile, the underlying business hasn't changed much. Over the long term, the share price is likely to reflect the company's cash flows. So I think the big question is how much can sales growth push the share price higher. Investors, however, shouldn't underestimate the potential of SpaceX's strategy.