I'm late getting back to this thread, and I don't have much to add that hasn't already been said. But what the heck -- it's a message board so I can "me too" as much as I want.
I think this project can only succeed if it is clearly a hybrid between story and game supplement. Readers need to know what they are getting into. And the existing audience (i.e., EN World) will only pay for printed copies if they contain useful gaming material, not just the story.
A simple print-out of the story, no matter how nicely illustrated, is going to flop. Because most of us have no qualms about using our employer's laser printers to spew out 1,000 pages of
Lady Despina's Virtue.
One area that I would emphasize is the "this is how D&D should be played" aspect, or the
learn from the masters. You could then market the books to new gamers, as well as old gamers wanting to learn new tricks. Look at someone like Johnn Four's DM advice publications, and column in
Dragon magazine, for inspiration. People eat that stuff up. Everyone wants to be a better gamer.
Don't try to hide the fact that these stories are based on D&D campaigns. Revel in it. Embrace it. That's how to succeed.