Rich results do not raise a position, they change how a listing looks — and a listing that occupies more space with more useful information is clicked more often. That makes structured data one of the few interventions that moves revenue without moving rankings, which is also why it is worth doing correctly rather than broadly.
Eligibility requires the markup to describe what the page genuinely shows. Marking up ratings you do not display, prices you do not offer or FAQs invented for the markup breaches Google's structured data guidelines and can trigger a manual action that removes rich results across the whole site.