There are some people who price items at a loss. It would be a good idea to have a system that notify or ensure there is a minimum of 1 gold profit for an item to be listed. What I mean is the sell back price is better than listing it in the auctions. Just something to educate new players.

Screenshot example:

Item listed and selling at 110 gold
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The amount of gold needed to list that item with the cheapest 12 hour slot (110-106=4 gold profit)
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The sell back value is 8 gold so loss is 4 gold.
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It will be a good thing to implement to help players know how to use the auctions efficiently.