Gold and silver are valuable because of their inherent stability, malleability, beauty, scarcity, and the fact that they cannot be man-made, which is why they have always been the dominant form of currency.
Even if the silver ran out, he could easily introduce a substitute once Jade Peak Immortal City was fully established.
It wouldn't be difficult to launch a new currency based on Spirit Stones, have it circulate among the nations, and exchange their existing silver for it at a fixed rate.
Besides, he didn't think the silver would ever be completely depleted, just that the amount in circulation would decrease.
No one uses silver in the Cultivation Immortality Realm, so bringing some over later wouldn't be a problem.
As for exchanging Points for silver? He would have to be a fool to make that trade.
Once Luo Dingran understood, Cheng Zongyang didn't wait any longer.
He immediately used all the silver for expansion.
