Welp, there's your review for Amazon: "Sense. This product makes none. 5 sneers."
Nah, don't do that, they'll cut you off and you won't get any toys to play with.
I made the mistake of giving some honest, constructive and mostly positive reviews, with 3 to 4 stars. Not what the vendors wanted.
Also, Amazon seemed to catch on to vendors who offered discounts and refunds for reviews. I bought two pair of Przewalski shorts a couple of years ago. They were already very inexpensive but the vendor practically gave away the second pair for something like $5. And they really were terrific buys. I still wear 'em often.
But Amazon rejected my glowing review, which was completely honest. The only detail I dinged the shorts for was the fancypants script logo, which wore off quickly even with hand washing. But I still gave 'em 5 stars. The DuPont CoolMax pad alone made the shorts a must-have for me. But Amazon thought my review sounded like a shill and rejected every attempt to publish it, even after I toned down the effusive praise.