Most people are rich, but why? The main reason is restocking, and one favorite spot for their restocking is… the chocolate factory!!! =0
Items deflate when they are not rare and not needed, and rises when there is a demand for them (in quests, training schools) and that they are rare.
Therefore, in the chocolate factory, you should refresh every 3 seconds for consequently 30 minutes or more. When there is a restock, do not panic and refer to the points below.
Do not buy items priced at 2500np, they are scamming items as they are not famous for quests and deflate quickly and are what you call hts (hard to sell) items.