While I agree in principle, I don't think these three sites in particular are good examples against scores. If you completely ignore the scores, just using the

While I agree in principle, I don't think these three sites in particular are good examples against scores. If you completely ignore the scores, just using these three sites "correctly" will naturally increase your karma. I strongly suspect the people who are on any of these sites for maximizing the score are in a vanishingly small minority.