User blog comment:ISharkyShark/Marketplace: Inconvenient/@comment-28478783-20170523004938

It is possible that this is to be in par with many other games with in-app purchases, which don't usually use actual money as currency within the game. This also has a weird psychological affect, where when you spend in-game currency it doesn't seem as costly as spending actual money for game-related things. However, as you do point out, it means developing an extra step that in a way is almost unnecessary.