In your skill line upgrades you have the prerequisite of being a "Skilled Antiquarian" to purchase the upgrade. By purchasing the upgrade the player would be able to raise his Scrying and Excavation lines to the maximum. DO YOU NOT REALIZE that to be a "Skilled Antiquarian" that you have to already have them at the maximum level????? I can purchase the skill line upgrade for every other one offered. I can only guess that you just didn't realize this contradiction when you included it in the list of available purchases.