Shops will no longer buy items that would zap the shopkeeper.
In practical terms, this generally means that shops will
not buy items that were enchanted by the opposite side.
For example: Angdil will not buy an evil-enchanted eket,
and Kormock will not buy a good-enchanted eket.
Note that shopkeeper inventories have not been filtered,
so some shops still sell items they won't buy back.