They say the book 'Rich Dad Poor Dad' was actually a promotional tool for a game

The book <Rich Dad Poor Dad>, which we read with such emotion, was actually a promotional brochure for a 'financial education board game' that he was trying to sell. Although he self-published a thousand copies, not a single one sold initially; however, it became a mega-hit after spreading through multi-level marketing groups (such as Amway). It is a very shocking fact that the 'investment bible' we revered was actually a marketing product that grew through multi-level distribution channels.
That is what they say.