i started out in a phd program because i wanted to find out if i really liked mathematics, which i had always assumed. then i washed out in the furore surrounding the vietnam war in the 60's, and taught a while but was faced with losing my job unless i got a phd. at the time i thought i knew more than my colleagues who had phd's and felt it unfair that i needed one to hold my job. then i went back to school and struggled to get the phd, and learned that there really was a level above what i had reached; i.e. i may have known more facts than my friends but had done no original work; so although i hated the brutal graduate experience, starvation wages, unlimited work requirements, lack of respect,..., I appreciated getting to a higher plane of understanding and achievement. At that point i actually resigned from the previous desperately valued job, and stepped out on faith to get one year's further training, to rise further in understanding, and hoping for another job afterward. fortunately it worked out for me. so for me it meant becoming a mathematician, something i had always dreamed about. financially it was not a plus, as my colleagues who stayed at the teaching college earned more, but i got to do research and meet with and learn from famous figures in my field.