"Coming from a rich family" or "part of a Native American tribe" is not a wide enough distribution of people to draw conclusions. Any failures / successes could be down to the environment and may not be able to be extrapolated to the rest of society at large.
On the other hand, if you're wondering if people who after the end of highschool, are able to finish college without having to get a minimum wage job to pay rent and for college, are doing better in life after college (and what measured amount better), the data already exists and there are far more than 2000 subjects.
