Doctors, startup founders, software engineers, rocket scientists, professors, world-class musicians, and everyone you actually want to be importing foreign talent for, typically gets a modest, medium-range, middle-class salary in the US, at least when they start on any new project. Even Nobel laureates and Pulitzer prize winners usually get very mediocre salaries.
Having the H1B admission be based on salary would probably just fill up all the H1B quota from Wall Street, not serve as an effective talent filter.