Yeah, after reading a good third of his biography, Walt did make some good business choices, but also took lots of risks involving several loans and borrowing money from everyone. He even made huge mistakes involving ownership, but still bounced back.
I'd also mention Ralph Bakshi specifically for his work on Wizards. Fox turns him down for extra money to finish the battle scenes so he super-imposes old war footage, makes some rotoscope changes, and the film breaks even within two weeks of being released.