I was surprised to find the palm of my left glove to be wearing thin and a tiny hole appearing in the same position as your grip wear. It might be related to how our hands sit when operating the clutch, and whether glove or grip is more durable.
Grip wear like that shows that you ride your bike instead of parking it outside coffee shops. Consider it like the knees of your Levi's starting to fray. It won't be long before they sell distressed grips so the coffee shop dwellers can look like you.