Many growers have a passion for collecting their own seeds. In times gone by all gardeners kept their own seeds as there wasn't the choice of seed suppliers around as we see today. In certain areas this tradition has kept going with many rare regional varieties floating around that are simply not available to the public at large.
This group brings together growers who collect seed. They can swap and discuss varieties and compare their individual seed 'banks'.
So if you'd like to swap your collected seeds or are looking for something unique this is the place to be.
Or you can just save money by swapping seeds rather than buying new from seed merchants on an annual basis.