They do it because sometimes they can actually sell it at this price. Sometimes markets dries up and someone might need this item now and don't care for the price.
I did it with light leather at some point. I listed some stacks at 130% of the normal rate with my other stacks at 100%. I got some of the 130% sold due to the low supply one evening.
Also it messes up the numbers in Auctioneer.
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