Only a few could get burned before the vendor is flagged as a counterfeiter which would stop further purchases. That should reduce the amount of money you could make scamming people and make it a less viable criminal business. Amazon also seems diligent in refunding people as well.
So the solution might be that Amazon should invest more in shutting these accounts down faster but I'm curious if reviews are an immediate stop gap solution here until they get around to regulating each bad seller.