Bankers convinced investors to believe in a sci-fi strategy, overlook SpaceX’s steep losses and hand full control to Elon Musk.

Analysts disagree on whether SpaceX is worth what Musk is asking.

NEW YORK/SAN FRANCISCO, June 11 : As SpaceX prepares for its record-breaking $75 billion market debut with great fanfare, Wall Street traders, brokers and exchanges are working…