Why is the Joker so insanely obsessed with Batman?

Remember the scene from The Dark Knight where Joker burns a pile of cash with a wide grin on his face? That pretty much sums him up; he is not the kind of bad guy who runs behind money or fortune. read more

The joker drives Batman to the point where any other human, given the opportunity, would go crazy and bash his skull, but the Dark Knight simply won't budge. Batman is the anomaly in the Joker's perfect world. The Joker is so insanely obsessed with him, because he is the living proof that you can survive the ‘one bad day'. read more

The Joker is a self obsessed egomaniac. If he's going to be insane, he's going to make himself the most insane person in existence. He's so insane he makes other people go insane. "When super-villains want to scare each other, they tell Joker stories." This explains his obsession with Batman. In The Joker's eyes Batman is insane, like him. read more

After the Batman RIP arc, Bruce Wayne-Batman disappears and is believed to be dead. During this time, Dick Grayson battled for the cowl and won it, becoming Batman. A mysterious new writer/investigator is in Gotham. Oberon Sexton from England. Batman(Dick) figures that Sexton is actually the Joker! With no Batman, Joker lost his purpose. read more