This is a rather crude metric because it presumes one can monetize all the traffic they receive AND one can generate as much profit per visitor as Google does. Anyone who could do both of those would likely displace Google as the first consumer destination in their market (like how many people in the United States start ecommerce searches on Amazon.com rather than Google.com).
All you would have to do is write a decent review and use some Long Tail marketing keywords scattered inside of it. Do it in a way that the reader doesn’t even know you’ve slipped in 20 long tail keywords. Let the article flow naturally with a clear tone of honesty…as if you were talking to a friend. People who read your review want to feel a connection or a solution or a even a need to buy that product. This is where you use those Long Tail Keywords.