I point you to my response to the crush thread....but:

Pursuing somebody who is challenging and fun is also fun. But if the person has no interest, then it's silly. Being aloof and challenging is something that both genders generally like (the others being those who don't like playing games), but I have a problem with your choice of words. Playing hard to get is just 'acting' aloof instead of being aloof, which will backfire on you, because you are being deceitful and manipulative to get your own way.