The default framework is the existing legal system. There is one, therefore one exists. In that framework, there is no legal limit on how much you can earn.

That framework is the default for the legal understanding of what is right and wrong. If you want us to change it, the burden of proof is on you. Bare assertions of "that's immoral" aren't going to be enough. You need to make a much more robust case than that, one that's not just soundbites. (At least here. Most people here can think at deeper level than soundbites.)