If people arispe to receive backlinks then they might want to at least have the decency to post a related and thorough response. All comment spam will do is maybe damage your backlinking attempts and creates useless links. The only way to behave is to befriend fellow bloggers who have blogs of a similar subject matter and generate genuine targeted traffic by making a well thought out reply. Hopefully people might think about this prior to replying after me, Many thanks.