The multiples and orders of magnitude of difference in the payouts are what make the decisions that the various people make interesting and complicated. The author did what he needed to do to make you feel those orders of magnitude in difference.
Also it is very funny to think that somebody who has 1.8 billion dollars is not greedy. I don't think that is impugning their character to point out something obvious.
And either way, the author isn't making a legal or moral argument one way or the other. He's just telling a story about his emotional response to this complicated and unique situation. The fact that the people on the other side of the story effectively have infinite wealth and still made the decisions they did is important to the story! It makes it easier for us to understand their motivations. He's a writer who wrote a story, it's not a wikipedia entry.
Just because it’s his story doesn’t mean he can’t be immature and wrong in it.