“Our courts have consistently acted on the view that it is their function in the ordinary run of contentious litigation to decide only live, practical questions, nor do they exist to advise litigants as to the policy which they should adopt in the ordering of their affairs. The courts are neither a debating club nor an advisory bureau. Just what is a live practical question is not always easy to decide and must, in the long run, turn on the circumstances of the particular case” “Our courts have consistently acted on the view that it is their function in the ordinary run of contentious litigation to decide only live, practical questions, nor do they exist to advise litigants as to the policy which they should adopt in the ordering of their affairs. The courts are neither a debating club nor an advisory bureau. Just what is a live practical question is not always easy to decide and must, in the long run, turn on the circumstances of the particular case”