If you're not being sarcastic...
Those "Verified Purchase" reviews can also be faked by manufacturers/sellers reimbursing the credit-card payment of the Amazon shopper.
Example: https://www.buzzfeednews.com/article/nicolenguyen/her-amazon...
Well, I got contacted by the seller, offering me $20 to take down the review. I ignored it.
Then a few weeks later, they upped the offer. And in response, I downed the stars.
Last I heard from them, they were offering me $70 to take down the review. For something that cost under $15.
Amazon itself doesn't help either. I bought something (a food item) from Amazon, and it was nowhere close to the quality in the photographs or description. I wrote a review, describing how the actual item was of much lower quality than expected. Amazon refused to post my review! And I've been an Amazon customer for nearly 20 years!
And this really is a decent biz model. I mean, free items, just sell them for 50% and you can make a living.
Scale this up using multiple amazon accounts, multiple addresses.
The market is big enough so that you can make a living out of this, I'm sure.
And your x2 multiplier makes it even easier!