I agree with you Brian to some extent but I think much of it has to do with the fact that many teams (at least i do) try to win at home by spreading their bench around and resting some of their best players who may need a blow from time to time. Given that I cannot manage my team on the road, i try to have the best lineups in there all the time so I have to rest the Mike Piazza's of the world some time and tend to do it far more often when I'm playing at home.