Yeah, but see, Batman's mythos is much richer and has been expanded upon since his creation. He's not the same gun-toting, purple glove-wearing vigilante that he started as. Plus, he has a much, much, much wider array of villains and supporting characters.
Punisher...does not. He's got, what? Jigsaw and The Russian? His villains are always mob-related. Anyone else he fights, it's heroes like Spidey or Daredevil. He's a bigger loner than Batman, too, so he's rarely had anything in the way of a supporting cast. If he did, it didn't last.
What I'm saying is that Punisher is still a very limited character compared to many other comic characters.