Finally, somebody that gets it.

Somewhat related:

My brother was a Division III All-American in college. At the urging of his coaches he bulked up and added another 15 pounds of muscle for his senior year (without steroids). Guess what? His production went down because he lost flexibility and bat speed because of the extra muscle. That's another thing the typical armchair moron doesn't understand. Extra muscle does not translate into more power.
Roids, on the other hand, allow you to recover faster from workouts, fatigue, and minor ailments. It's not the muscle, but the recovery ability that's paramount, just as MBFlyerfan points out. It keeps you at peak performance more consistently. This is especially important in baseball because of the "grind" these guys go through with a 162-game schedule (plus Spring Training and maybe the playoffs).