- Given that masterworks quality items are rare and they provide important bonuses to crafting, having them wear out would probably be viewed very unfavorably by many, especially if wear also reduces the quality (as I believe is the case with nets currently). Note that weapons and armor can get worn/damaged by combat.
- The "gate" item already exists in the form of the door. Only bears know how to open doors, and yes, you can build a door in between two fence sections.