score:1
From anecdotal experience (helped a few friends and heard a lot of feedback), US doesn't seem to care as much about your income as UK. Your travel history is way more important to get a visa. Some of people I know well, who are just backpacking the world and have no serious income, got the US visas easily. And some other people with good income and property ownership were refused visas because they didn't have any significant prior travel.