It is because of tradition. If you think there`s a stool, you wouldn`t deal with a vampire. Note: The Tomb Kings are the only faction that use resources for their mortuary cult mechanic (Edit: A similar mechanic called forging has only been added for dwarves in Warhammer 2 since it originally posted this answer). For all other groups, resources only increase the value of trade agreements. They are therefore generally right to think that these resources are not actually used by the trading partner, but not in this particular example. Political groups can agree to trade with each other through diplomacy. A trade deal between two groups I`ve also never seen evidence that more trade resources increase the likelihood that someone will accept a trade deal. The diplomatic system here is very veiled. They even took the boats and cars of the poor little diplomacy on the campaign map. They waved the finger at diplomacy and also took trade routes. On the left (your page), the user interface shows you how much money you make from trading and what resources you export to your trading partner.
The right side shows how much money they make and what resources you import from them. Beastmen, Greenskin and Warriors of Chaos factions cannot act. By clicking on a political group, you can also see different information, for example. B all contracts between your political groups or commercial goods available to that group. . . .