I specifically make my mission to not buy items that have been dropped by 1 gil. If both items were the cheapest I'll buy the more ''expensive' one.' In reality one gil isn't much. If your going to discount make it meaningful in comparison to the product. I don't like undercutting but to be honest I do it. Ideally my product sells before it becomes a pissing storm, but its pretty frustrating seeing on the history your product sold for one less gil.