If you had any doubt, Robot 6 points out that three of the top five grossing iPad apps this year are comic-book-related:
This reflects not just the quality of the iPad as a comics medium for comics but also the large numbers of comics that must be selling through those apps (the apps themselves are free). The top grosser in the book category is The Elements, a visual exploration of the periodic table, which probably doesn’t have a lot of mass appeal but sells for $13.99, and the number five app is The Cat in the Hat, which does have a lot of appeal and sells for $3.99. That three comics apps can match that tells me that people are buying a lot of comics through them.