Not only can a homestead support itself, at a certain size, it can even generate profit -- this depends on it's size, and the surrounding market. The options are only limited by your imagination and motivation. Extra produce can be sold at farmer's markets, roadside stands, or even directly to restaraunts or grocers. Other goods can be turned into pre-made goods, like jams, jellies, dried goods, baked goods, ciders, clothes, blankets, etc. Your homestead itself can generate profit by offering classes, tours, group experiences, dinner party tickets, or building a guest house that can be rented.
Craftsman goods can also turn a large profit for their handmade, artistic value. This can involve woven baskets, tanned hides, wood carvings, hand-made furniture, etc. The materials for these should already be available on your homestead, and the amount of labor and effort that goes into these products is valued very highly by potential buyers.
