> intentionally easy to forget how much you are spending Which is why a lot of mtx are using some kind of "prenium" currency that's bought with real money, usu

> intentionally easy to forget how much you are spending Which is why a lot of mtx are using some kind of "prenium" currency that's bought with real money, usually in increments different from the prices in the item shop (so that you always have some left-over); then there's the limited revolving selection, to use FOMO (currently used by Fortnite, for example)