From the general bent of this thread, I am thinking that survival silver is pretty much a waste of time.
One of the foremost SHTF possibilities (and a very real possibility these days) is an economic collapse- which could be a long, drawn out event that devalues the dollar and other core currencies. Setting aside precious metals is one of the smarter things you can do. Just remember to buy on the dips.
Think about it - the European economic situation is nearly unrecoverable, and we're not much farther behind them. We may see short term rallies, but I don't see any long term direction except for down. Ultimately silver and gold may not get you very far, so you have to have a plan to trade out of them at peak pricesfor something else of value.
I don't think any serious prepper should leave precious metals out of their plan. It's just one of many solutions you should have at your disposal.