One point that has not been made here yet: Because you enjoy doing research and teaching more than you would working in a 9-5 office job! I'm approaching the e

One point that has not been made here yet: Because you enjoy doing research and teaching more than you would working in a 9-5 office job! I'm approaching the end of a 4 year PhD and so far do not miss the world of work too much. But ask me again in a year...