When you make something by hand, you leave a part of yourself in it. When you are finished creating, you take pride in the work, partly because you see yourself in it. When you buy something hand-made, you see our common humanity in that purchase.
An item that has been crafted as an expression of the creative spirit of the person who made it, is treasure and valued, far beyond an item that was manufactured by machine for mass consumption.
It is simply human nature to recognise & value our creative spirit.