I think the most import thin about PM's is where do you hold it.
Who owns your gold and silver? In your house/garden nicely hidden if the preverbial does hit the fan (isn't this the reason to own PM's), or do you trust a bank vault in London, Switzerland or the USA?
If the economy tanks further and a real crisis ensues then governments are going to look at stealth ownership of those nice bank vaults. Buy at $1,600 an ounce and then next day re-price gold at $10,000 an ounce.
Likewise if a global crisis ensues then do you really want a 3rd party to hold your gold? There are a lot of conspiracy theories about whether the ETFs and other electronic forms of ownership actually hold what they say and dont lend it out. Who knows.
Over the long long (100 years or so) term gold has delivered a very poor return. However all asset classes go in secular cycles of 10-25 year uptrends followed by 10-25 year downtrends.
I would hazard a guess that gold and silver are 1/2 way to 2/3 way through a secular uptrend.
If you are investing for the short to medium term then expect at least 30-50% volatity, especially for silver.