Is it a one way street?

I notice that when precious metal prices rise the US Mint suspend sales, but when price fall they are reluntant to do the same, in that lower prices. In the last month platinum per ounce has fallen about $300 from $2,085 to $1,785 but the one ounce uncirculated remains at $2,349.95. I beleive that when you trade in precious metal you not only take the upside potential but also the downside risk.