I haven't had any success with amazon developer services after having been a developer for 5 years.
Ads only earn pennies when there is incentive for the platforms algorithm to do so. Whos mantra must be "stop paying developers and stifle there effort".
List prices earn nothing as amazon decide to "calculate monthly adjustments to keep the money for ourselves".
I speak after having sold an app for 2 and a half years and ran ads for 4 years. You would expect some money to be mine after this but no, sales have dwindled and ad value has reached zero. Its obviously my game that has lost its momentum.
The case remains why the reporting of units sold based on my listing price set haven't promised me the money customers have paid for.