It's just for fun and interest, as the other replies have pointed out. I've added my standard disclaimer to the comment above. Reposts are fine after a year or so! This is in the FAQ: https://news.ycombinator.com/newsfaq.html.
Thank you for the link to the FAQ! Unless I blacked it out, I don't think I have read it before. Now that I know it exists I can see it clearly in the page footer, alongside the Guidelines... I will go and read those, but I also wonder if this should be reposted from time to time too.