This links back to discussions about the fall of Rome from before, where there are some moneterist arguments about what caused it. Basically, that part of what undermined the Roman economy and lead to its collapse was the great drain of silver towards China along the Silk Road routes because China sold silk (and spices coming from other Far Eastern destinations) in return for silver, but was very reluctant to spend silver to buy anything coming the other way, This led to the continued debasement of Roman coinage as European silver mining couldn't keep up with demand, and the amount of 'good' currency
Hence Constantine stealing the secrets of silk.
Here, the dwarves would be playing the role of China, sucking specie out of the Empire's economy.