I think some users have managed to get on enough auto voting trails that it makes sense to keep publishing. I guess I can see why they might if every post they make, gives them a few more HIVE even when they don't respond.

For me, the only reason to post is it share something, in the hopes of getting a reaction and discussion. I have spend a long time on some posts just reading the comment sections - there is a ton of additional information in there.