Use of IP to country locator

"Rate of turnover is among the few points where your company is out of control. It it seldom enough to know your present customers. Where are the potential customers, and how do they get permanent?"

Here are some example of usage:

Statistics of visitors on your web-site. So you can do a purposeful advertising campaign in the area where your visitors (i.e. your customers) are
Tailor your homepage to the needs of your visitor, e.g. in terms of language, special offers etc.
Access control: Limit the access to certain locations.

Hopefully this gives you some hints of usage, and now you probably know what you can use this for in your business.