All these subprime lending companies were growing so rapidly, and using such goofy accounting, that they could mask the fact that they had no real earnings, just illusory, accounting-driven, ones. They had the essential feature of a Ponzi scheme: To maintain the fiction that they were profitable enterprises, they needed more and more capital to create more and more subprime loans.
The ability of Wall Street traders to see themselves in their success and their management in their failure would later be echoed, when their firms, which disdained the need for government regulation in good times, insisted on being rescued by government in bad times. Success was individual achievement; failure was a social problem.
Note: Probably not the best philosophy to live by