Hmmm, the extension IMO doesn't fit. If it was a .com you could sell the name for a nice amount and built a website with it. Seeing as it's a .org I'm really not sure if it's worth making it a complete site. Name itself I'd say low $XX.
Could be developed for assisting non-profit groups in getting a website. Hosting, design, etc. Price would stay low with this extension, but could still get $xx+.