The examples they show have little captions that say "best of #", like "best of 8" or "best of 4". Hopefully that truly represents the odds of generating the level of quality shown.
I guess here's an example of a prompt I would like to see:
A flying spaghetti monster with a metal colander on its head flying above New York City saving the world from and very very evil Pope.
I'm not anti/pro spaghetti monster or catholicism. But I can visualize it clearly in my head what that prompt might look like.