It would seem that despite amazon stopping their rewards program for reviews, that 3rd party sellers have found a way around this in order to get 5 star reviews. Things like this make me feel most review systems are now massively compromised without requiring any skin in the game.
"Sellers reach out to Jessica through targeted Facebook ads touting free items or dedicated review groups with thousands of members, and give her a specific set of instructions to purchase their products on Amazon. After she leaves a 5-star review, the sellers reimburse her via PayPal or an Amazon gift card, and let her keep the items she reviews."