Under Sartar’s rule, the people turned from pillage to trade. Sartar built roads and forts to protect the traders from raids. He fostered literacy, experimentation, and luxuriousness upon his subjects. His dynasty grew and would have rivaled any empire for sheer splendor had it survived.
Argrath’s dharma is not to facilitate trade (and Argrath definitely is a good patron for LM – who is to say that the Illiteracy Crisis is not the results of a Lunar hero quest gone terribly wrong?), it is to be the Moon’s shadow self and break the world so it can be remade.
One might even say that clip suggests that Sartar is not actually a classically “mighty-themed barbarian” nation but a civilised trading culture where the tribes maintain social importance, but have largely been supplanted by the cities.
Or at least it was until the Lunar Occupation changed that.
Objectively, the Princes of Sartar were surprisingly rich as a result of controlling the main trade route through Dragon Pass. Look at Palmyra for an example of how wealthy that can mean. The principality always punched above its weight – and during the reigns of Sartar, Tarkalor, and Argrath it really did.