How Much of Your Budget Goes to Running Your Application Servers

Most code that you write, you don't know how it's going to be used. You're going to get a lot more users or one of your users is going to put a list of 300 things into a report that you think has 10. It's good to have a feel for any given thing you do and try to avoid algorithms that tend to completely fall down and die when they get 10 times as much input as they wanted. O of n type notation is actually good for predicting the behavior of an algorithm.