No big comment, just a coouple points. First of all lestagii heals both mana and health while potions heal only one or the other and therefore take twice as much time to heal. As a result Lestagii is inherently more valuable to anyone who gets involved in the odd fight. Because lestagii is so valuable it is in high demand and is overpicked. An increase in potion prices will cause the demand for lestagii to exceed its current level and further deplete the number of these plants that are available. This in turn will raise the price of lestagii to a level reflective of its demand and rarity. So in the end potions do not end up costing perportionately more but simply cause a rise in pricea of all healing items.