I think something happens to people when they get more than a couple of thousand followers, unless they are a known journalist, author, news org, etc.
The hand waving starts about reaching follower milestones. “C’mon people, just 400 more and I’ll have 10K.”
At that point, I suspect that the “worth it” factor starts to drop a lot, and I lose interest and often unfollow.
OK, delete Twitter, but with caution, it can be one of many useful tools.