Many companies offer extended warranty or appliance insurance with their products. These offers are often very profitable for them. While they offer "peace of mind", the warranties are often very restricted and for a limited term. In some circumstances they make sense, but in general, if you saved the money, you could "self insure" for whichever appliances need replacement.
Some credit cards automatically provide a warranty or extend one you purchase. When that is taken into account, it can significantly affect the value.