"Not-for-profit" is sometimes a misleading term. It means there are no owners taking money out but most of the larger ones have employees and officers that work on salaries and some of the salaries are very high. The American Institute of Philanthropy at the web page below lists 25 executives of not-for-profit organizations that are paid in excess of half million dollars per year. Some over two million. When you look at those salaries, there is profit in working for most of the not-for-profit organizations.
There are many other volunteer organizations that are truly not-for-profit such as local homeless shelters and organizations that feed the poor.
Their goals depend on the objectives of the organization. The SPCA, Little League, The Red Cross, and a church would set their goals in very different ways.
The American Institute of Philanthropy:
http://www.charitywatch.org/hottopics/Top25.html