I was talking about when strategically you would bind something. Why bother to bind something at 100% durability, you might want to trade it. But you wouldn't want to wait for it to get to 1% durability and then bind it because although it will never be destroyed, it won't take much to make it useless in quest.
So if you bound with 60% perm damage you could die 3 times + take some in quest damage and still not have taken enough repairable damage to break the item in quest.
Make sense?