Well they do have a large fan base from the D&D books
The only thing I can come up with is maybe they are trying to appeal to a more general audience with the game, maybe kids or younger players that would have been attracted to the old choose your own adventure style books
Or the very basic D&D type board games that game out
I don't get the Ebook thing either other than they're putting the cost on the customer to print out the adventure books rather than include them in the basic game. They shouldn't assume every customer has some type of ebook reader or tablet or if they do wants to use them in their gaming sessions.
Yeah I'm sure the game makes for a reasonably good story telling game with a group. But I just think a choose your own path book would have been just as good. So what are they trying to accomplish here.