You can attract antisocials and narcissists this way. Primary psychopaths tend to make long-term victims of narcissists by feigning empathy. However, this is very likely to backfire if done to a psychopath or decently intelligent antisocial. A narcissist needs constant affirmation of worth. Psychopaths and antisocials don't, so we're more likely to see through the ruse.

It can backfire with narcissists too, but for different reasons. Just because you've attracted them with your deception doesn't mean you can easily manipulate them. This applies more to malignant narcissists... Take my father, for example... You could easily get on his good side by playing the "yes man" and he wouldn't give much thought as to whether or not you were deceiving him. You see, he truly believes that he's magnificent enough to have an army of "yes men", so he isn't likely to see your behaviour as bizarre. But he's still in control of you. It's like you've caught a fish that's much too big for you to handle and now it's dragging you into the water.

*edit*

Also, once you enter into one of these "games"... Especially with a psychopath... It's incredibly difficult to step away. See my "game playing" morals: http://forums.psychcentral.com/showthread.php?t=224450