I too have an unrelated degree and am self taught. I also make much less than the numbers in the provided tool but more than make up for it by living in a low cost area where developers are always in huge demand.

I have found the biggest discriminator on hiring salary and hiring generally is due to approach to problem. If you are limited to a single convention, such as OOP, or are limited to certain tools/frameworks businesses are less eager to hire you. In theory that makes sense in that you are more valuable if you can provide an original direct solution to a problem with greater ease. In practice it doesn’t make sense because those limitations tat prove to be a negative bias during hiring tend to be the reality internally.