My calculations tell me that the silver content in US 90% coins is 15.3 times face value. Right now half dollars are for sale in Buy It Now for 16.4 times face--a premium of 7% which seems reasonable. But silver dollars, whether on this site or at local pawn shops or coin stores, sell for more like 24 times face value.
Why is there such a disparate premium on silver dollars? Do they ALL carry a numismatic value or is something wrong with my observations and/or math?