They are, by definition, not fans, and therefore unlike fans they are unconcerned with minutiae and continuity.
Minutiae and continuity in a work of fiction has nothing to do with fandom. They are just details within the fictional world someone is building. Good work makes sense, bad work doesn't. If an author is concernced with creating a thoroughly thought out universe, you receive that. Think Tolkien. He wrote his universe FULL of minutiae, according to your logic, for the general audience, since he didn't have a fan base to begin with.
There is no connection between audience reception and internal continuity. There is no connection between good/bad and made for fans/made for non-fans. Seriously.