I know this isn't helping the problem, but I get really mean when people undercut me. I will undercut by 1-5gil on an item worth 1k+, essentially matching the price. I sell small quantities more expensive than full stacks. But when three people constantly undercut my 30k item by 5k every 20 minutes (being a total of like 5 items on the market), until the item is worth half the amount, I play dirty. I mine all my own Gold Ore, so I'll make a bunch (1-5) of what ever the item is, 1 star GSM items, and sell them all for 1g each.

Honestly, screw you! If you're gonna make the item worthless I'm just going to start giving them away for free, because I'm not making any money anyways! And since I have 100s of gold ore extra it doesn't even affect me at all.