Indeed, as the Wealth-guarding Ghost said, this was a major move that could change the ghost-tale world.
For the players, the advent of grass baby currency facilitated the circulation of resources, benefiting their survival in the ghost-tale world.
For him personally, the circulation of player resources was also advantageous for his accumulation of wealth.
Given time, the Wealth-guarding Ghost's jar could accumulate millions of various character charms, and he would be equipped with all sorts of bizarre items, allowing him to basically walk sideways in the ghost-tale instances.
Of course, the premise was that he would not encounter any root ghost tales.
Root ghost tales often possessed conceptual-level abilities, against which the players had no defense.