In my early days of reddit i got a bit invested in karma. Enough that i did change the way i posted a bit. I got a few 1or 2k comments, noticed they were pop culture references, and tried to emulate that success.
I grew out of it, but you see how the karma system incentivizes that type of comment.
I agree with you, but it's an addiction to approval. It's similar to cracking a joke and everyone laughing at it. It is sad but it's also pretty human.