Let people pay for a manual review (say $300) with Google refunding the amount if it's found to be erroneous.
1. The support cost is totally offset -- at $50/hour, it would give someone four hours to investigate and two hours to prepare a report.
2. Bad actors won't pay, and neither will people who haven't really made money on the store
3. Google develops an actual framework for resolution
4. Some level of trust is developed again
5. It helps provide better training data for Google's automated process -- the engineers behind it probably cost $300/day each.
I really can't see a situation where this would incentivise Google to steal money. It would land them in much hotter water than anything else they've been involved in before. We're talking international lawsuits if just one single support staff decides to be a whistleblower. It's too involved of a conspiracy.