yeah but at least this requires work. at least you're putting the barrier up of having to login over and over. if you do detect login abuse voting, you simply

yeah but at least this requires work. at least you're putting the barrier up of having to login over and over. if you do detect login abuse voting, you simply ban the IP and throw up a message saying "you've been banned for..." my experience is that fake account voting is way way less frequent than double IP voting.