Right, I agree with your gold and silver are safer and provide greater profits than deposits. the longer the money is saved the more the value decreases due to inflation. and fiat money is influenced by the instability of the dollar. so saving money in gold and silver is more profitable and safe.
Some $40,000,000,000,000 is invested in gold worldwide. As they say "money is measure of success"
Gold and silver both are precious metals with which one can make money after selling it on high price in its high market. Furthermore gold and silver both are safe and easy to handle, On the other hand banks will cost you per month or annual cost from your banks account and there are many other terms and policies of banks so the simple investment in gold and silver.
This concept of keeping the money in banks for interest has destroyed many economies. IN the European countries, there is a trending concept of negative interest rate right now that is the bank will charge you fee if you want them to take care of your money.
This has given rise to investments because people do not want to pay the fee so any excess of money that they have go into investment which further results in the production of goods and services improving the GDP. So yes it is good to invest in gold and silver rather than keeping it in bank.