@DJ_CUTY, I found Jason’s thesis statement for CoG that I was looking for earlier. So hope that’s encouraging.
Less encouragingly, he talks elsewhere about “the reason our games are priced so low. We think they should really be closer to the price of a book (like, $8-$10), but the higher the price, the more likely it will be pirated… some people will just pirate because that’s who they are. But I think there’s a middle ground of people who will pirate if they view it as too expensive, or, conversely, if the amount of money saved by pirating is negligible compared to the time spent torrenting, then they’ll just pay.”
So I’m not sure the price will scale in the way you want it to. To make money off a long work, you might want to think about whether your 300k words can break down into 2 or 3 volumes (as Tolkien had to with his 480,000 word behemoth).
A few months ago, I was sure that Choice of Rebels Part 1 was going to be a six chapter work, just because the arc I had in mind didn’t end until you’d had the chance to take on the nobles in the capital city… but I then figured out a way to make the arcs end in a semi-satisfying way (I hope) in Ch 3, which should make it both more manageable and in the end more lucrative.