Kids that start CC threads and then don't respond to posts. What's up with that?

Actually, the adults who do this bother me more than the kids. Often seems the kids are in a momentary funk (at least here on Parents Forum) and then move on. But parents often get many responses with good information and advice and never come back to update or thank everyone. Of course there are also times when the responses likely make the OP run for the hills, which I usually think is a shame. Not really helpful to shame and blame someone asking for help, but that does happen too, to both kids and adults.