Earlier quoted context omitted.
Multiple currency types are a key part of freemium / microtransaction games, but there are other reasons to have multiple currency types, and it’s becoming more and more common across all types of games. In a sense, games are often about managing resources. Currency is a resource. If you have one currency type, you can come up with a dominant strategy that maximizes production of that particular currency type. If you…
I think multi-currency systems can be used to juice microtransactions pretty hard still. For example League of Legends gives players free "chests" and free "keys" as a slow-drip, and you can open any chest with a key to get some random loot. If your chest count doesn't match your keys you can buy more of either using real cash. So basically multi currency systems can be used to keep players intentionally in a state o…
By comparison, there are plenty of games (especially older ones) with only one or two currencies. Maybe you just find the one place in the game world that lets you grind out those currencies the fastest, and you do that over and over until you’re sick of it.