I don't understand, are we still on the topic of whether or not "extreme undercutting" in the MB should be a violation of the ToS and considered harassment? It feels like people have gone off by the wayside for several pages.

Anyway, I'll weigh in that people should be allowed to post an item at whatever cost they want. That of course doesn't necessarily mean it will either sell exorbitantly or even give you a return on what you paid to attain it. Here's the thing, if you think that the price someone is listing something is absurd then you should buy it and re-list it. If you're right then that means they are anticipating less demand for the product than you. As an example, I listed a bunch of Rank V materia at a price that was much more realistic pre-Stormblood. Sure it took a while to sell, but it still sold for the price I put it at despite being nearly 50x as much because that's how much people are willing to pay for it. Essentially, if your item truly is worth the price you put it at then it will sell at that price regardless of how low it currently is due to a few people undercutting the price.