Most individual people can only hope to make a minuscule difference for the climate. I don’t think it’s really irrational to try to make that 0.1% difference, just a recognition of our limitations.

I think 0.1% is an exaggeration, and the price drop would be even less. The amount of silver even in all the silverware put together is dwarfed by other uses, even investment (which is stacking it in a vault for future use). The point is that depriving yourself of sentimental objects just because you imagine some green outcome is silly. The absolute most environmentally friendly use for the silverware is to put it in the hands of someone who WANTS silverware, because of the substantial costs required to make it in the first place PLUS the costs of remanufacturing it into other objects (which you also have to assume in the transfer to your proposed use).