Baseball players and talent

Brian and I have been discussing the art of baseball. This past summer he pointed out that if you hit the foul ball pole or the net, then it's an automatic home run. This is my question: Baseball players get paid millions of dollars. Why don't they train (at least a little) to aim for the foul ball pole every single time they're at bat? If the point of playing the game = winning, and winning = more money, then why don't we have more players aiming for what appears to be a relatively easy way of hitting a home run?