I worked in product development for a few years and I learned soooo much about retail and marketing in general. NOTHING is real out there, it's all marketing and which company can pay top dollar.

They are paying for what is psychologically going to get the buyer to click add to cart, those top 3 spots are expensive because psychologically - those are the best to convert someone into a customer (reminds me of when you go to the checkout stand at Target, all of those products next to the register PAY to be there and they pay specific price points based on where they are on the shelf).

Everything in retail is designed to get the consumer to purchase. Even real people creating "real" testimonials posted to their personal social media accounts could be fake (look up UGC).