The way the capsule machines actually work in-game is that the probabilities of getting each potential item are roughly equal, and you get around 10 "pulls" for

The way the capsule machines actually work in-game is that the probabilities of getting each potential item are roughly equal, and you get around 10 "pulls" for an extremely common currency, where each capsule is from a predetermined pool per machine of around 4 items. Which makes pulling nonrandom given the law of averages. It's effectively a joke.