I am not an expert in building up business cases. In my time, there always is someone who help me build up business cases for the projects that I was working. One of them once told me that business cases are not stated as sum total amount or comparison cases, it starts with zero, “Why is there something rather than nothing under given circumstances?”. If there is this project what it would look like with it, then what it would look like without it. Some businessman may be able to relate this when they cannot just simply kick out some of the products in their product line which doesn’t make much profits but covering fixed cost as small proportion.
This is called metaphysics in philosophy which is the very first reason for philosophers to appear 2,500 years ago. The metaphysics including but not limited to what the universe is made of, the nature of human existence, what the nature of whatever it is that exist now, which give the same impression of “Why is there something rather than nothing?”
Something is sometimes better than nothing while sometimes nothing is better than something. Let’s say you have a kid who long for an expensive toy in which you buy something that is affordable for you. You will definitely try to convince him that at least something is better than nothing. Or you are in a relationship with the wrong person then you are better of alone than being with a wrong one which means nothing is better than something. If we think of this, an obvious question occur “How can we know?”.