If the marketplace worked under "normal" rules, then your recommendation would work exactly as you describe.
But J.P Morgan can always invent paper silver & gold products, which are no different than fiat paper money. The Comex market, and all of the ETFs are based on these paper instruments.
So regardless of what you buy (or do), they can and they will flood the market with paper instruments, and artifically keep the price down.
So they will always manipulate and control the price on the market, and the price in which you either sell or buy.
You can own physical, and it will always be worth more than $0, but at the same time the price will always be a manipulated and a controlled price.