Offset spring kits???

Has anyone relocated their springs 1/2" by just redrilling the holes for the front and rear hangers 1/2" inboard? I'm in the middle of doing this and it seems a lot easier and cheaper than just buying one of Mopar's offset kits.

Also, why does Mopar advertise their kits as a 3/4" relocation, when in fact you can only move the front hanger 1/2" before it hits the frame?