What else would you even measure? How much other people love what you made? The fact that lots of people pay you for it measures that. How much what you made helps other people? The fact that lots of people pay you for it measures that. How much you're able to contribute to good causes? How much money you make influences that. Money is a tool, it's created and traded with others as a means of exchange. If you make something valuable, you are given money for it, which you can use to make claims on the output of other people's work. There's no grand evil conspiracy here.