"Bonnie wants to be the only source of information about her mystery on the internet, which I think is a reasonable desire since she is the creator (but a difficult goal to achieve, given its popularity and the nature of the internet). One of the reasons she has mentioned in the past is that people get things wrong and then she is eventually blamed for putting out an inferior pattern, because people got their information from somewhere else. "
This and other reasons given I think are valid. Another is, that after the first of the year, the mystery info/instructions will no longer be available for free. We are her beta testers and once the directions are refined the pattern will be for sale. If there are lots of examples and numbers floating around, accurate or not, that interferes with her future sales.