So are you saying that, let's say I only use 2 cups of flour to make chicken and dumplings. I would have the flour later to make more chicken and dumplings, is that what you are saying?
Flour goes into a lot of things. You have the flour left you can use it to make cookies, to make a nice gravy for a roast or in many other things. In the long run cooking from scratch is much cheaper... But you do have to know how to cook and you have to use up the ingredients or you have just wasted your money.