Who will buy or could afford 100 ounce bars of silver after the price goes way up?
As the price of silver moves up, there will be many more traders of silver. For example, at the top of the real estate market in Florida in recent years, one person in 50 was a real estate agent. When one person in 50 is a precious metals broker or dealer, when it is very easy to sell, that might be the time to sell. Silver and Gold are always very liquid, and will always be liquid assets because of their intrinsic value, and special properties. There will always be someone much wealthier than you, who will want to buy your silver, such as industrial users, refiners, brokers, or bankers, and most people will never deal with them directly, but will sell it back to the coin shops, who will, in turn, sell it to new customers.