I agree it's going to be an evergreen. Super easy to explain and sell concept. Appealing art. Standalone story that is perfect for new and lapsed readers. A list Bat characters. It has all of the elements that go into making a lasting tpb seller. If Murphy makes himself a bigger name, I could see this cracking the top five selling trades eventually. It's not beating Arkham Asylum, Dark Knight Returns or Killing Joke but I think any others could be eclipsed.