I dislike an excess of currencies in the MMORPG genre. I believe that such systems are implemented with a deliberate intention to obfusticate and dissemble. Especially if such currencies are bought with real money. Consider the following scenario. A player buys a specific currency and then uses that to purchase a second, different currency. They then use that to obtain an ingame item, The sole intention of such systems in video games are to disassociate the player from the fact that they have made a purchase which has a real cost. These are manipulative and predatory business practises but such is the nature of the video games industry and they are commonplace. You have to keep your wits about you when spending money ingame. Sadly those who don’t, end up falling foul of such practises.