Canning your own food is definitely less expensive than buying cans at the store or buying other food storage options like dehydrated or freeze-dried foods. By canning food at home, you'll be able to save a lot of money that you would spend on the same kind of food at the store. The same goes for food allergies.
REMEMBER: If you are canning low-acid foods such as vegetables, broth, and meats, you WILL need a pressure canner. However, if you are canning high acid foods like jams and jellies, fruits (like canning peaches), applesauce, pickles, etc., you can use safely and confidently water-bath canning.