I have seen several hits from "Amazon researcher" that say they pay 0 but you must qualify to work on the hit. What do these hits really pay?
These are copycat HITs of other requesters. These are for reviewing and verifying the answers of the workers who've done the original HIT. It requires AR-WA qualification. Some of these HITs are paid hits, some are not. Who is actually doing them is still a mystery. It might be some peeps at Amazon itself.