Answer:
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
The more I appear The less you see. So riddle me this: What could I be?
In many hallways you would stand, if not with this in hand.
What is full of holes but still holds water?
Cut the wrong wire and it goes boom
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.