Imagine accusing a guy who could with a stroke of a pen have earned many millions of dollars in royalties and didn't for purely artistic purity reasons of a cash crab. What a silly thing to say.
To be fair to Bill… he didn’t hype up anything about it. The media did. It was heralded as the second coming and, much like Duke Nukem Forever, some things are best left in the past. It’s ok.
You yourself mentioned that Bill did not hype up anything about it, nor did you really counter with any arguments to prove that it was financially motivated.
I myself have not read it, but just because it was not what you expected or what the media portrayed it to be does not make it a “cash grab”.