i do get what further's saying - moving to digital print media takes the physical object out of your hands, for good if we're not careful.
i tell myself that if i puchase an ibook and really really love it i'm going to make the effort to go buy the physical copy, but then i'm spending twice as much on the same book... the marvel app for comix seems pretty convenient when you want to read some comix, sure, but half of comix collecting is collecting the actual comix, lending them to friends, storing them in their little protective baggies, etc.
it was the same question with digital music downloads, if you purchase something from iTunes, where's the album art? where's the liner notes, and what do you stare at when you're listening to weedeater, high on acid? what, the computer screen? please, have you ever looked at an LCD display on acid? it looks totally fake.