I think it is incredibly important to make sure that every tiny detail is considered when designing a solution, else you could end up with a solution that looks lovely but when you get down to using has silly idiosyncrasies that have just been overlooked.
Now put your user hat on: you are a busy business person and you have lots of important tasks that need your attention. One of your many tasks for the next hour is to enter you company details in to a service directory. There are 25 people in your company. See how long and hard you have to think before you can choose the correct company size from the drop down (see image below)?