User Default

have you ever wonder?
Most of use Automated Cash Machines ( such as POSB, DBS, OCBC, MasterCard, American Express .. etc ) to withdraw money. Have you ever thought that the main thing that we use that machine is, Insert card, PIN Number, Cash Amount, Money withdrawed, and take Receipt. That is the main purpose of a User. As long as we want the money, we get it and the amount withdrawed and balance is right we are happy. We do not care who's behind that machine, is it a Lady or a Guy? Yong or Old? Big or small, all that actualy does'nt matter...right?
That's the same goes people who make use or other people, they know what they want, they know who to look for, after they got what they wanted, they leave you. Just like the machine, the people does'nt care who's behind it.