Many people lose their incredulity once more than a few sentences have been read. By the time someone has read a second paragraph, they have internalized what

Many people lose their incredulity once more than a few sentences have been read. By the time someone has read a second paragraph, they have internalized what was at the beginning, and to be told that those two paragraphs were fiction is now to attack the reader instead of the text. As though reading were so laborious, there's a sunk cost fallacy.