I think it is a combination of a lot of things. Sellers wanting to make a huge profit refusing to share those profits to the ones who buy items in their stores. For example, glue. I go and chop trees for firewood as I have a hard time finding coal. I get sap and at the same time I will do some hunting while out and about. Getting bones. Sap, bone = glue. I put out the labor of collecting, use of my machines to cook the glue and a seller wants to give me 2c for the glue and sell it for 20 coin. He/she has no expense but wants to make a huge profit. Give me 8c so I feel it was worth it and you can charge 20 and make 12c profit.
That’s just a example of what I see on many items.
Frustration of finding shops to buy items at reasonable prices. I spend more time running all over to find decent priced shops than I do cutting down trees for sap and killing goats and spitters for meat and bones. I’d just as soon do without and my son will eventually make some of the items. He can now make gold fists.