But my HN client cache the frontpage when you go through the articles so you have to manually press a button to refresh it once you want to see something new. Does the latest scoring from this minute actually matter? Similarly, there's little need to automatically refresh the comments if you go away from a thread and click back within one minute. Maybe you can implement another method for dealing with upvotes/downvotes so they don't require API requests.
It just seems crazy that the average person uses multiple hundreds of API requests per day.