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The review process is too time consuming and difficult to do properly that I'm not sure any amount of payment would lead to sufficient investigatory work.
Yah, this probably would incentivise reviewers to do sloppy work so they can make as much money as possible. 150 dollar per paper can quickly become profitable depending on the country.
There should be a way to improve this business model while enhancing ethical behaviour, but it's a difficult balancing game.