What are they for?
Well, that's not true. The fact that they aren't directly related to what you're trying to deliver is precisely why they exist. The 'nothingness' of their value is why they are valuable. An embellishment, a garnish, a filigree… it exists because it means you took a little extra time, you cared enough to add some beauty or rhythm to the thing you brought me.
As soon as we can afford it, as soon as we care, we pay extra for beauty.