Piggy Bank is now doing his best due to what his friend Equinox entrusted him with. He is given a bunch of rare herbs that could sell for a huge fortune if done correctly. His jiggling belly is vibrating with delight because of this.
Still, the path of a merchant is very arduous, and trust is a big deal. Once you lose someone's trust then you lose a potential customer, and it means that you also lose money. He might be a bit sly when it comes to prices, but he never cheats when it comes to goods.
For Piggy Bank, quality is better than quantity and he always live by that fact. That does not mean that he disregards quantity, but one knows that easy to acquire and numerous goods are not going to make you famous in the merchant world.