Drawing a conclusion from the arrival of the torrent version and the conversion rate drop seems dubious at best because your conversion rate is based upon downloads of the DEMO version of the game. Those who download the torrent version of the game aren't going to bother downloading the demo version because they don't need it. Therefore the torrrent downloads aren't going to have any significant effect on your conversion rate because those downloads don't count towards it. Anyone who downloads the demo version at this point simply is either unaware of the torrent version or chooses not to participate in piracy.