Kids ask "ahh, gee, when will I ever need to use geometry?" and the answer is when you realize you got ripped off by paying the same price for a 1.5" diameter tungsten sphere as you would for a 1.5" tungsten cube.
In terms of bullion value, absolutely. In terms of cost to manufacture, maybe not? I can't imagine making a sphere meeting any kind of surface tolerance is any easier than making a plain old cube to a similar surface tolerance.
