And it may also have to do with your definition of 'dockworker' ; Dell's mom and dad were a stockbrocker and an orthodontist; Clinton was working-class but not poor; same with Jobs (he was adopted at birth, dad was a mechanic, and mom an accountant); Brin's dad is a Math prof and his mom works at NASA; seems Koch's grandad was wealthy (I can't find more on wikipedia; it also says he went to MIT and doesn't mention scholarships, so his family was probably well-off).