Money should be important to everyone. It's great to love your job, but you still need to pay rent and feed yourself. And in some places, that's expensive. Teaching college is one of the lowest paying positions you can get with a PhD in math. My friends who went into industry with their math PhD are making twice as much as my friends teaching college - but the ones teaching college are doing that because that's what they like to do. They aren't broke, they just aren't rich.