The narrator comments on the structure of the book, showing how the book is a parody that pokes fun at the conventions of more serious books by pointing out how contrived they are. The narrator’s metaphor about inns is fitting, giving how much of the action in the book takes place at various inns across rural England. Homer didn’t actually sell
The Odyssey as a subscription, but many of the authors in Fielding’s time (including Fielding himself) used this model to make money.