Most times, I see topics by lower-ranking members about something they don't understand, and there will be answers and solutions to that problem in the comments, but there is no follow-up reply by the OP. It leaves me wondering if the person actually reads the replies to their posts. When you read the replies, you will learn more or have more questions.
Not only do they create a topic, then leave it open and never reply to it, but they also create other topics and do the same thing. It's quite annoying to see users like this because they simply don't respect people who try to reply to their threads.
At least reply to one or more replies from other users, so there's a healthy sense of interaction and mutual respect in the discussion.
If they only open threads and then abandon them, I don't think that's how forums work. And it seems like they want to farm merit.