All-"Star" Batman + Robin

Does everyone remember last year this time when All-Star Batman and Robin came out? It was during the San Diego Comic-Con and it was a huge hit. Top of the charts - in fact, wasn't it the highest selling book in the past 10 years?

And what have they produced since that first landmark issue? Only three more. In the course of a year. 12 months, 4 issues. Huh? I know Frank Miller and Jim Lee are very busy guys, but why aren't fans outraged? How can you successfully serialize a story when you're waiting usually more than 12 weeks for the next issue?

Boggles the mind.