There are many benefits of self-sufficiency. Self-sufficiency not only saves you money, it protects you from the vicissitudes of life and also helps to protect the environment.
Sufficiency is when you have enough for a life of well-being. A big part of self-sufficiency is knowing how much is enough. If you can reduce your material needs you might be surprised how little you actually need.
Modern economies are good at providing extrinsic satisfactions but the benefits of self-sufficiency include intrinsic satisfactions. Self-sufficiency is surprisingly satisfying as anyone who has grown vegetables will tell you. It provides us with intrinsic rewards like a sense of achievement, self-esteem and self-confidence.