*By supporting the "little guy" you're putting money directly back into your town or city. The "little guy" buys his seeds, fertilizers, and equipment from other "little guys" in the area, and that's a good thing for everyone involved.
*Eating food grown within your immediate area cuts down on carbon emissions - less gas, less packaging, less middle men.
*If you have healthy, fresh food in your home, you're more inclined to eat it. Not to mention, if you develop a friendship with your local seller, you'll want a reason to visit and support them often.