I know it's difficult for Americans to comprehend the value of mixed education, such as the guy you talked to. With his finance degree and plumber experience he will know how to fix plumbings and he will be able to run an efficient business which may even grow enough to hire a few guys in the process.
It seems entirely expected today for higher level business and government to have both JD and MBA degrees. So why not History and Biology or Art and computer science? There is so much to learn from people with very different perspectives.
"OMG what are all these physicists doing in finance?" ___anticollege tards probably