I have no issues undercutting to a break even price, I'll go below cost of mats for HQ if I farmed the mats myself, I don't have much tolerance for people undercutting me. If someone undercuts by 1g, I'll undercut by 100 to 1000. My retainers are constantly full, dead items sitting there cost me more than selling something at cost and I'd rather be crafting than micromanaging the market board.