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You even said it yourself - if someone undercuts 5k~10k, you either wait it out or you take the steep penalty yourself to undercut. If you undercut by just 1, then you're almost guaranteed to have someone undercut you without blinking. The entire point of steep undercutting is to reduce the number of immediate competitors while simultaneously increasing potential demand, which increases the probability of your item being the cheapest on the list when the next demand comes in. From there, there are two basic possibilities: (1) the lowcutter just wanted to get rid of his item quick, so once it's gone, life can resume as normal, or (2) the person re-supplies at that same low price, which will likely start a crash. If option 2 is chosen, you actually get an interesting rubberbanding effect where prices will start high, drop to no profit, and then repeat over a period of time.
I go heavy on alch right now, so let's take an example: