With the most recent gameplay update reworking gear and broom materials, also came the heavily decreased the amount of gold that quests give. With that said, I think that the cost of chests that you can buy in the Mining Depot should decrease. 50g per chest is quite expensive now, seeing as how lower-years (particularly year 2 and year 3) only have on-average about 200-300 gold, meaning that they spend most of their gold on chests if they were to store their items.