I saw a video of guy who became an Amazon bestseller in a book category pretty easily by buying his own book.

Through my professional / personal network, I know someone who advertises himself as being a “Best Selling Amazon Author in XYZ category.”

It is semi niche, but I did some ballpark math, and about 72 sales rapidly would put him in the top spot for that niche.

That number sounds about right when he’s mentioned the gross $ sales of his book.