While it's the first work I'm reading on this topic, I'd want to ask, why so much interest is focused on miner's earnings compared to the core developers?
Because the mainstream media doesn't hype it every day whereas they constantly talk about mining!
The media constantly talk about mining activities.
Also the government keep shutting down large mining farms for reasons such as electricity consumption.
These and more keep miners activities on the mainstream. Also consider the market volatility. As the bitcoin price keep going up, miners earnings increases and people talk about them much during network congestion.
In the other hand, developers work just behind the scene.
Is there any data to show how many core developers are also miners?