Spinel's must be the primary currency in your shop. Selling/Buying shops are already locked to only use Spinels as the currency, but if you plan to create a Trading Shop, make sure that your primary currency is Spinels, or that you have other villagers setup as buying/selling villagers that accept Spinels as payment. We want to help stimulate the economy of Spinels, and ensuring that players are on board with using them as a currency is an important measure to take. On average, less than 15% of your shops should use trading villagers. The Moderator team will check shops occasionally to make sure you are following these rules, and if you aren't you may be asked to change your shop.