People who are motivated by fear, and easily swayed by paid advertising.
Here's my rule of thumb: if it needs paid advertising, it's a shitty investment. #1, good investments sell themselves. #2, who do you think pays for the ads? Yep... you as a customer, through the inordinately high expense ratios on these accounts.
If you really want to hold some precious metals, look at the ETFs that invest in them. GLD, CEF, etc. Much cheaper/easier to buy and sell, same effect.