I fail to see how undercutting someone by 1 gil is "cheating". You obviously don't care about whether or not they make gil, so why should they care about "playing fair"? If it's common knowledge that the first item will be selected on a list sorted by price, even if it is 1 gil cheaper, then you would be a fool not to take advantage of it. Not to do so would be about the same as DPSing on a MNK without using any of your skills, and being upset that the DRG is outdpsing because he is "cheating" by using all the tools at his disposal, IE skills, when you chose not to.