Why not have many strong reasons instead of one weak reason?

There are contexts in which one doesn't have access to many strong arguments.

In terms of picking a major, do something you enjoy that you can conceivably use to get a job. You can actually get a job with a philosophy degree. I did... after I quit accounting because it was too darn boring...

I'll clarify that I wasn't arguing that one should major in a quantitative subject — my discussion was restricted to earnings, not to the holistic impact of majoring in a given subject.