You could say because they already had what most experts called the best team in the NL, that most writers picked to go to the WS in '07. But they still brought in Moises Alou during the off season, who just hit .341 in '07. And they let Bradford go because they didn't want to give a reliever a 3 year contract. The bull pen was supposed to be one of their strengths.
In '06 at the deadline, they traded for Shawn Green in an effort to strengthen an already strong team. But I guess you'll find a reason to pooh-pooh that too.
Lets not forget to that we didn't have the farm system, especially after the Santana trade, to bring in someone at the deadline that would REALLY put us over the top.