Moderators do move post or threads that are not relevant to the forum to the off topics section, since it doesn't really count especially those members who are in the sig campaign because no sig member I have seen post there
Tell me that you haven't really checked off topic section without telling me that you haven't checked off topic section. 
Joke aside, its certianbly not the most important part of the forum and generally speaking discussion quality is not very high but its still one of the things that every forum that is fosuced on something specific (like bitcointalk is) has because people have other interests so if they wanna discuss them here, why not? Its certainly better than having to go someplace else.