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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
I know someone who's all over that silver shit. There's some guy on youtube who's raving about silver this and silver that. But my opinion is anyone who advertises a money making scheme isn't using it make money themselves so it's likely bollocks.