The MOMENT you sell it you've lost the potential advantage it holds. Prices will fluctuate over time BUT the whole point with holding physical pm's is that you always covered regardless of what the dollar does. The second you turn it back into dollars you lose that. In my opinion you shouldn't see physical pm's as an "investment" to be converted at a given value but as a hedge against the possible catastrophic failure of the currency markets. If that happens, THEN you might look at redeeming small amounts of your pm's at a time in order to preserve your "savings".