But I never said anything about monetary greed. I said the problem with Cameron is that his pursuit of pushing the boundaries to technology in his films is what limits what he can do because they end up being too expensive to do "right" as you put it, because scenes are simply too expensive sometimes. If he actually felt that the actual material was that important, and that telling the best story he could was the most important point, he would find a cheaper way to make his films. Clearly, that is not his preference.
His desire to sacrifice runtime for IMAX is not out of greed, as I already stated in another post, but one of fiscal responsibility. He has to ensure that the movie makes tons of money because of the heavy amount of trust the investors of his film has put in him. I don't think that is a bad thing, it is a good thing and a realistic approach.
I'm simply saying that if telling the best story with the narrative and writing alone is Cameron's most valued aspect of the work, he would not be making movies like this. But he is, and that's neither entirely a good or bad thing, just a conscious choice. But that choice can be criticized.