I was in the missile business for 30 years and I used it...but I paid nothing for it....now I don't use it as I am retired and it would cost me. There is another benefit from using nitrogen in tires...it leaks out at a much slower rate because the molecules are bigger in nitrogen than molecules in air. But to me that is not a feasible use per cost. Unless you plan on landing the space shuttle and don't want to blow some tires I think you are just wasting money...but each to their own.

Regards