Honestly, nobody even looks at other people's Karma. I didn't care much about it. Did people really care so much baout Karma that they mourn about it here, or miss it, or used to farm it?
Sorry if the tone sounds judgemental, but I'm just wondering.
Some subreddits require a certain level of karma to be able to post or reply to comments. I don't know if that was to help against bots or people who would make an account to avoid a ban or something. Other than that karma was just an ego boost for those who cared about such things.