[behnamoh]

I would partially agree. Yes, it's stupid if you have enough time "and" money to go to university and study math. Otherwise, if you have enough time, this plan might work for you. But, I wouldn't consider it a wise move, because science/math graduates are already struggling to find jobs in/out-side the academia, and a math degree from a decent university goes a long way in landing you a job.

I think, math, unlike CS, is not a "skill" you use in your everyday work. Whoever does math/science has to dedicate much of their life to it. CS you can learn on the internet, by MOOC's, or just by reading books about it. Math on the other hand, simply doesn't work like that.

To be clear, by math, I mean "advanced" mathematics as the title indicates. Elementary (and intermediate) math is required to learn no matter what.