[1] Generally, superficial charm is an effective way to ingratiate or persuade[2] and it is one of the many elements of impression management/self-presentation.
Flattery and charm accompanied by obvious ulterior motives is generally not socially appreciated, and most people consider themselves to be skilled at distinguishing sincere compliments from superficial ones;[2] however, researchers have demonstrated that even obviously manipulative charm can be effective.
[2][4] The effectiveness of charm and flattery, in general, stems from the recipient’s natural desire to feel good about one's self.
Individuals with antisocial personality disorder, for example, are known to have limited guilt or anxiety when it comes to exploiting others in harmful ways.
While intimidation and violence are common means of exploitation, the use of superficial charm is not uncommon.