I have a math degree, it has in no way negatively impacted my career.
Actually, taking the time to get a degree may have negatively impacted my career. Which is to say, I don't feel that having the piece of paper has really had much of anything to do with my career.
But maybe I wouldn't have worked out what I wanted to do without the time to screw around and learn whatever I felt like.
I think that a math degree is pretty much always a boon, since in just about every field, they need people who are good in math, but most people who don't have a math degree are scared of serious math. (Physics, EE, and other engineering degrees, not including CS, probably don't count in the being scared of math category, so for those fields, having a math degree may not be as much of a boon.)
Actually, taking the time to get a degree may have negatively impacted my career. Which is to say, I don't feel that having the piece of paper has really had much of anything to do with my career.
But maybe I wouldn't have worked out what I wanted to do without the time to screw around and learn whatever I felt like.