It truly, truly sucks that Mathematica would cost me nearly a month of pay. I'd love to have it and use it, but that is just far too much.
Mathematica just does some super cool things and encourages a different pattern of thought, which I'd love to play with.
(seriously though, I'm not a student. 2 credits at Johns Hopkins, right down the street, are about the same price as Mathematica)
"Note: Mathematica for Students is intended for students enrolled in accredited academic institutions and is for use on a student's own personal computer."