The value of your work is what clients will pay. Clients are not a social cause -- they are consenting, for-profit businesses. If they agree to pay 3x what you think they should pay, you should graciously accept it.
As for why our work is so well-paid, it's because we automate things, and automation kills jobs. That's the sad truth: you can measure our value in how many people our software saves our clients from hiring.
A good example: one of my clients was struggling to find $160k/yr financial analysts. Their jobs were 90% copying and pasting data into Excel.
We automated the copying and pasting, and now that client isn't hiring any new analysts.
We spent $30k on the software and our client saved at least $800k. They pay us somewhere in between.