Person A may not like and not care about person B at all, but play a false polite role in order to make person B do something which evolves around person's A interests.
That's not being polite, that's being manipulative.
Being polite is saying "please," "excuse me," "thank you" when you're supposed to. Being polite is not cutting in line and not talking with your mouth full. Being polite is something you do because you were raised by human beings and you know how to act like one. Being polite has nothing to do with fooling someone else into doing something for you. Assuming we're thinking of a similar scenario, I'm guessing they do whatever it is you want them to do because they have no other choice - not because of your mad skills at falsely being polite.
Either way, politeness isn't something you're supposed to use to gain something in return. What kind of sad life experiences could you possibly have had to lead you to that conclusion?