Tom, I think it's rather reductive to say that a reader purchases "the ability to read the story" in the cases of both print & digital. With print, foul play (such as theft) and paper decomposition are the only ways outside influences may infringe on that ability. With digital a reader is beholden to the Marvel/Comixology relationship remaining strong, to Comixology staying in business, etc. I agree that each format has its advatanges, but I'm still wary about going digital in this regard.