I think for this kind of question, do not think to much, just say the truth, of course if reason was to make lot's of money, travel the world with hot FA's etc., maybe you should re-consider your answer.
And here is the problem. The reason to have a career is to be able to provide a good standard of living for your families future. This industry is going to s
t because too many morons just want to fly that visual approach in an A320 or some other BS even if they get paid less than the person who cleans the plane after their awesome greaser onto that short runway. Not saying don't enjoy your job but for gods sake it is a job that should pay well.