Even though the Symbian Foundation is a non-profit, in order to sustain long term existance a good combination of a opensource community and business partners (foundation members) is needed.
A good working example for this is the Eclipse Foundation, working with a similar "business model" (for the lack of a better word - eventhough it's non-profit and meant for better collaboration and development):
- allow independent as well as
- funded development while allowing both
- businesses to use the source in their products incorporating their own intellectual property as well as
- independent parties to use their source.