Many people won’t understand what 30x face value means, there is face value - ie a silver Dollars value is $1 and then there is melt value (a silver (.90) Peace Dollar 1922 melt value is worth $32s) this is due to silver price being more expensive now than it was in 1922.
A peace Dollar might not even be de-monetised so it would still be worth $1 dollar in exchange for goods and services or you could exchange it at a bank for a Dollar note. The fact that it’s worth more as silver is down to the markets, you can sell it for silver at the best price you can get (no one is forced to give you the market price because you are trading goods, in this case metal) where as a dollar it is worth a dollar, not higher not lower. You have to find the best place to sell at a price you are happy with - a dealer takes the risk that the price may go down and will cash in large amounts at a time, not small amounts - so they might buy your coins and have to hold them for many months before they have enough to trade in, in this time the price may have fluctuated and they run the risk of losing money if they pay too high a price. They also need to make a living from the trades they do.
There are jewellers, coin shops or online mail-in traders who deal with precious metals, you simply have to find the best price - no one has to pay you the market price. If you hold your coins for another 5 years and the silver price drops to $15 dollars for a 1922 peace Dollar, then you would bite the hand that offered you $18 now. Any dealer can offer you $18 for a 1922 peace Dollar, it is not stealing it is market forces - it is your choice if you want to sell $1 at 18x it’s value, shop around maybe you will find someone willing to give you more or maybe not, that is down to you to get the best price - or speculate that the price will keep going up and keep them for another 5 years.
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