Hi, you find more often than not the gatekeepers or middlemen determine the distribution of revenue in the music industry.
Individuals are not necessarily rewarded based on working harder than the next individual. At the moment people are rewarded based on popularity, and popularity is built up by marketing dollars. Hence fair revenue does not really exist. Especially in the music supply chain, there are various people involved in the creation, promotion, consumption of music and they are not always recognised or compensated evenly.