Things are valued for their rarity, and this principle is applicable everywhere. However, because the Dusk Mercenary Group has a large number of people and covers a wide range, many things do not reach the level of rarity.
Even if certain items are temporarily out of stock, they will eventually accumulate again.
The reason things become expensive can only be attributed to the temporary out-of-stock period.
Items are like this; sometimes there's an abundance with no place to consume them, making them seem cheap. Other times, due to some reasons, certain items are heavily consumed, causing shortages, and the price shoots up.
The illusory hazy blossom is an example of this; previously, its utility wasn't high, and upon escaping the original world, even if one lost its biggest guarantee, few people used it, leading to only one or two consumed within a month, hence it remained relatively cheap.
