This isn't true for any company, not even investment banks. When people start companies, money is seldom a major reason, and as they grow they get a life of their own. Even large companies are run by people, people with feelings, insecurities, ambitions.
An incredibly wealthy leader of a large corporation is not really motivated by money, he wants more status, he want to look cool, he wants to indulge his fantasies.
Saying companies only exist to make money is just silly.