No, a scammer can say to 10 people "here's $10 to buy get an account, now leave 100 reviews and I'll pay you $1 for each" and that guy himself gets paid $10 per review directly from the seller. The people each made $100, and he spent $110 on each of them, losing $1,100 total, but he made $1,000 of each, so $10,000 total. At the end of the day he made $8,900 by acting as a middle man.
You're not factoring in the fact that if a Prime member participated in this, Amazon could suspend their account without any reimbursement. For most people, chump change is not worth nuking your $99 Prime account.
Also, the idea that sellers would pay $10 each for a 5-star review is laughable.
It's easy to make something economically viable when you're numbers are complete drivel.
