Since people frequently buy off of Amazon, the parent is not banking on people buying the kindle book, he's banking on them clicking his affiliate link and buyi

Since people frequently buy off of Amazon, the parent is not banking on people buying the kindle book, he's banking on them clicking his affiliate link and buying a bigger ticket item some time today which will net him more commission. The affiliate link to the $3.99 ebook is just to get them in the door and his affiliate cookie planted. So regardless of the review content, the fact that the parent felt the need to add an affiliate link to a $3.99 kindle book leads me to believe his choice was not based on the merit of the book, but because he wants to skim a few bucks off the HN crowd.