[dharmach]

Not being too rich or too poor allows engineers to become identity conscious, and being engineers they have enough analytical mind (plus time) to think & plan ways to attack the 'enemies of their religion & culture'. Remember that for bright kids in immigrant families and in developing countries, career in engineering is an easier path for upward mobility.

[amadeuspagel]

Lawyers and doctors aren't too rich or too poor to become identity conscious, and these professions are more typical paths towards upward mobility for immigrants.