The entertainment market is straightforward. Make recordings that sell, fill stadiums for your concerts, and you earn millions. Fail to make an impact and you earn nothing.
Wealth is not a pizza, where if I have too many slices you have to eat the Domino's box. In a free society, with the rule of law and property rights, no one loses when someone else gets rich.
It is a known fact that JK Rowling was paid all the money in the world for her Harry Potter books, triggering the global financial crisis and leaving no money for other writers.