ARghhhh!
Intentionally walking a guy is devastating to your expected runs you are going to give up.
Even if he hits .450 with 50 homers, it won't generate nearly as much runs as walking him each at bat will. Bonds doesn't make Sports Center from his walks, but I guarantee you he will score over and over and over and over from it.
It's amazing. People feel that it's ok to Walk Bonds and get beat by the next batter, and it's ok. But if you get beat by Bonds, you are an idiot. Who cares about the math, or any Monte Carlo simulation.