I never got the purpose of karma. You can’t spend it, it’s just a pointless number. A few subs used it, fire whatever reason, as a numbers threshold for entry, but getting karma was so trivially easy even without bots that it literally accomplished nothing in that regard.
Not that I ever cared about karma, but I can see why some people did. It plays into peoples need to be liked. Karma associates a number with how well your post is doing. Bigger number = more people liked your comment or post. Basically quantifying how well liked your post is and gamifying it.