I'm living in a house anyway. I'm not paying myself. Appliances last decades. It would cost me money to drive to a restaurant. With rare exceptions (e.g. high end kitchen you don't use much and eating out really cheaply) there's no world where the costs of preparing meals at home are higher than eating out every meal.
The point is that many people expect them to be priced similarly because they think of the ingredients as the main costs (because those are the only costs they actually see when cooking for themselves), which they are not.
