Here's a fascinating article from WSJ:

http://online.wsj.com/articles/business-graduates-show-least-interest-in-their-work-poll-finds-1412222464

It's a quick read, but has big implications about life purpose and choosing what really matters. 

Summary quote: "My advice to Americans, especially young people, is that if you make a decision about what to major in based on how much money you want to make, you might end up disappointed, not only with your first job but with your overall career," said Brandon Busteed, executive director of Gallup Education.

Advice?  Instead of only thinking about money potential, discover your passions and talents and apply yourself there.  The money will follow.