... is the banks are not paying anywhere near double digit interest anymore... which discouraged lots of silver hoarders from holding onto their precious metals, such as common 90% silver coins dated before 1964. One could cash in your silver coins, jewelry, silverware, etc. and put the proceeds into cd's at a nice interest rate back then.

Today, forget about it. A silver hoarder is not risking that much (other than a potential price decline) by holding on to his/her metals because the interest rate simply is not that high today. However, when the bubble bursts, everybody who is holding gets hurt.