As a for-profit entity, if you're successful in getting a good return on capital, you will attract more investment. You become a magnet for resources with which, in turn, you can do more. Taking that a step further, if you're a socially responsible for-profit, and you're successful in earning a return on capital, you will attract further investment, to create still more value, and be able to have a greater positive impact on society and the world. Essentially being a for-profit creates opportunity for doing greater good. And financial success as a for-profit with a social conscious carries greater credibility with your peers, potentially influencing actions of other businesses.
Source: Q&A: Brian Walker - Herman Miller - Social Capitalism: http://www.fastcompany.com/social/2008/articles/brian-walker.html
Contributed by: ~C4Chaos