I realize I represent only one of several types of students, but I couldn't care less about degree credit. I've got a BS in CS, and that's enough degree credit

I realize I represent only one of several types of students, but I couldn't care less about degree credit. I've got a BS in CS, and that's enough degree credit for me. But I would happily do all the coursework equivalent to a degree in math for my own education. I just don't care if anyone recognizes it as a degree or not. I'm not willing to pay degree prices for it, but I'd pay some token amount.