There are 2 reasons why items continuously increase in price:
1. People are not making sets and items because they end up losing more than they gain or gain nothing at all and lose everything, so they choose to just farm Dil instead and buy items. Since fewer and fewer people make items, and more and more people are farming pure Dil, because it's safe, the supply and demand for sets and weapons will continue to increase and so will the prices.
2. Some people just wants to overcharge everything to make a profit. These are the people who spend all day in ardeca buying items for a normal price and then selling it for more than it's worth. Then the person who overpays the item does the same thing the next time he sells it and so the cycle continues.
This issue is not only something the Rising Staff can solve on their own.
The players have to solve it aswell as it is partially their fault that the market is going to hell.
What Rising Staff can do:
Crafting needs to be more appealing than farming pure Dil.
Decrease the amount of pure Dil that is farmable in game and increase the upgrade rates again.
Make resources used in crafting easier to farm.
What Players can do:
Stop overcharging everything you sell.
Stop overpaying when people overcharge for items.
Craft more instead of farming pure Dil.