Happiness.

Been there, done that. I have two degrees in marketing. For a while I had a job I liked, but the next job was horrible, miserable, soul-sucking. So I took some classes and switched to software development, which I like much better. It was difficult financially at first, but that's partially because I was unemployed while I was taking the classes. My first job in software development involved a big pay cut vs. the marketing career, but I got by. Now I'm not rich but I don't get chest pains every day anymore, either.