"In one more week I was going to be a millionaire."
We don't know how long of a period it was on the best seller list at all. It almost certainly made it to the list because of activity following mention (as the author points out) "the story went viral and was featured in places like Forbes, Time magazine and NPR’s Weekend Edition" which had nothing to do with the quality of the writing but more of a David and Goliath human interest story.
So what we have is a book that made a list because of a cease and desist letter which got it major media attention which created a concentrated interest in the book.
The takeaway from this is that he made roughly $3 per book for a book that is sold by amazon at $14.95. (Also the kindle edition is less and I don't know how that factors into the count obviously.) Also to find creative ways to get publicity for your creative vessel. Pissing off a large company is certainly one way to do that. Then after the attention that generates dies down simply write another angle about how well you didn't do and get more publicity. I didn't buy the book but I did look at it on Amazon. Obviously the Salon story and links to it will help him sell more books.