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It was something about buying the metal rather than the shares because there's not enough silver on the planet to match the shares yada yada so if everyone cashed out they'd be fucked and if you have real silver you'd make a killing. Not the investment in silver/metals was the issue per se but the whole thing just seemed a little bit get-rich-quick kinda spiel.
https://www.youtube.com/results?search_query=silver+investing
Precious metals are one of the oldest stores of value known, hardly some internet pyramid scheme. Its a hedge well worth while if the impending Global financial doom which I'm expecting happens.