Actualy the physical properties of pure silver aside from it's being the best of conductor, may not be practical for that application . The cost of pure silver .999+ is only about $15-20 an ounce. So it is not as ridiculous as it sounds. I don't think that it's material costs are as much a deterent as is platinum's cost at $1,500+ or gold's at $1,200+/- or palladium's, or rhodium's or unobtanium etc.. Besides gold and platinum would be too soft.