Saving seeds is an important skill to have, it brings with it many benefits:
Seed saving covers all of the 3 permaculture ethics - earth care, people care, fair share/future care - as you can see above.
It also falls within four of the seven domains of permaculture action outlined by David Holmgren - land and nature stewardship, education and culture, health, finances and economics.
It is also closely linked with David Holmgren's permaculture principles:
1. Observe and interact 2. Catch and store energy 3. Obtain a yield 4. Apply self regulation and accept feedback 5. Use and value renewable resources and services 6. Produce no waste 7. Design from patterns to details 8. Integrate rather than segregate 9. Use small and slow solutions 10. Use and value diversity 11. Use edges and value the marginal 12. Creatively use and respond to change