I think you might be able to buy silver in this game, but it would take a little work on the buyers end. Like if you could find an item on the marketplace that isn't really stocked, then have someone with a lot of silver buy it. For instance, when I was still playing this game about a month or 2 ago nobody really sold a lot of the crafted furniture items. Some of those would sell for a few million each, but nobody would ever buy them because they are pretty much useless and would never sell. You could mass produce an item like those, and try to transfer coin that way.