Here's an interesting arbitrage angle:

You could flip 1000 dimes ($100 face value) to a precious metals refiner today and walk away with roughly $4500 in silver value extracted. Sounds like free money, right?

Catch is, pre-1965 dimes only make up about 1% of circulating supply. That's your real bottleneck. Even with that juicy margin, your hit rate on finding those coins kills the business model. You'd need an absurd conversion rate just to make it pencil out as a real strategy.