That's not in conflict with what I'm saying. Costs centers require a certain amount of investment to ensure the business runs efficiently. If you under fund it, the results are often catastrophic. However, if you over fund it (as in, put in more money than is needed to keep things working properly), there's generally no additional positive impact on the bottom line. So, from the business side, your main goal tends to be to find ways to keep cost centers running efficiently with less money... without inviting disaster.
It works, so it doesn't need to be changed is how most infrastructure deteriorates. Ask me how I know this. :)