Over at the Biz of Baseball, they break down the cost of each marginal win for every team in the League. What do we learn about the Astros? They spent a lot of money, and didn't win a lot of games.
What does this tell us? Basically, the Astros spent the most dollars/win in the NL Central. Only the Mets and Nationals spent more per marginal win in the National League.
What's a marginal win? Click the link for the hard math...