Anecdote time. (hey its saturday were I am ;-))
This comment: "at some point (and $) you lose the fire to write."
I had noticed the same thing with another author. And at the time I was working with Jerry Pournelle[1] helping him with things he didn't need or want to do with his BYTE column. I asked Jerry about it. His response was fairly enlightening so I share it here.
Jerry said that writers were arrogant, and in their arrogance they despise editors because editors tell them what they wrote doesn't read well, or isn't necessary for the story, or has the wrong character point of view and demand that the writer rewrite it. When a writer is young and hungry, they do this because they have to, if they don't they won't get published. But if they become successful, they get more sway with the publisher. At some point they have enough sway to override what the editor says and have them publish it the way they wrote it. And that is when you find out if they are a good writer, or if they are only a good story teller and without an editor their writing is sub par.
That made so much sense to me at the time and it was also the basis for Jerry's oft used phrase which was the secret of good writing was re-writing.
[1] https://en.wikipedia.org/wiki/Jerry_Pournelle