Probabilities

While discussing the game's rarity system:

Designer: So the game will feature 12 different objects that appear at random based on set probabilities.

Lead Programmer: Do you think we should keep track the number of times we've seen each of those objects?

Me: Why?

Lead Programmer: So you can know which object to spawn.

Me: ... well there are probabilities in the tuning...

Designer: Yeah.

Lead Programmer: But if there's a 1% chance that something will show up, you may never see it!

Me: ... yeah. That's how probability works. It's independent of the last time you did something. What would the point of different levels of rarity be if you just weighted unseen objects more heavily?

Silence.

Me: You do realize that if you flip a coin 50 times and get heads each time, it doesn't mean that you're more likely to get a particular result the NEXT time, right?

Silence.