If you are stacking to get rich, you are gambling. Might as well hit Vegas. If you are stacking to keep silver from those who make weapons with it, the market games become sort of irrelevant.
The real risk in silver as an "investment," in my opinion, is asteroid mining. I know enough about silver to be pretty damned confident that we are running out - on this planet. But then, if they get an asteroid load of silver before we run out here, we are all pretty much screwed anyway.
Love or fear? Choose again with every breath.