That is the scam with the pre—65 silver; when you try to sell it you get a “melt price” instead of the “spot price” you get with regular .999 bars (or coins). This crap is a hoax to screw the less-knowledgeable “investor”.
If something sounds too good to be true, it is; the US had to ditch the Gold Eagle for a Gold Buffalo because of the same issue; China, Canada, and Australia were selling pure gold coins, while we were selling second-rate, “melt-price” stuff; now we also sell a new, pure gold coin.
I think your claims of “hoax” and “scam” are unfounded.
Gold Eagles have always had a full ounce of gold, plus some alloying metals to greatly increase hardness.
Pre-65 coins have never claimed to have an even ounce of silver, although their content has always been consistent and well known.