It's becoming more and more frequent to see people choosing (usually) one item, and using all of their retainer slots (sometimes even on alts as well) to sell thousands of the same item at a ridiculously low price so that no one can undercut them without losing gil. As a result, they have full monopoly on that market, and it goes on forever (as in, they either never tire, or they're botting.) Also, they will often put up large stacks of said item to make sure people are absolutely forced to buy more than they need no matter what (and then be stuck with it).
My question is, is that even legit? Are people really allowed to do that without repercussions?
If so, is there anything that could be done to remedy to this frustrating situation? With the additions of extra retainers, could there have been a change to the marketboard? Could they show more than 100 hits on a single item? (I've seen items with more than a thousand stacks for sale, most of which were being sold by the same person over several characters/possibly accounts)
Has anyone else seen this before? What's your opinion of it? Smart marketing or dishonest practice?