Drag Truck WINS Race! *and weight update

It wasn't my cam that was reground. What should I have paid with shipping for a cam that's been reground but still "new"? I did NOT want a billet cam that needed a bronze gear drive.
I still do not understand how they regrind cams it has been explained to me but I still dont understand it. How can you take a cam with a 420 lift remove material and get a larger lift seems likes witchcraft to me.