I never thought of keeping all my Kudos. That is a fun idea and I may have to start doing that. I wish AO3 had a way to sort by Kudos count though. (I sent a support request and they said it's on the wish list but no one's picked it up as a project yet.)

I've seen multiple people talking about how it's a lot less anxiety-making to hit the Kudos button on older fic than it is to comment. Especially because we don't really have a culture of commenting on older fics.