Convertability; You do not have to send your silver through the mail or stand around someplace to haggle over the sales price. We are not at the point where most people will accept silver or gold as payment. (Yet...)
https://sprott.com/investment-strategies/exchange-listed-products/physical-bullion-funds/silver/
"The Sprott Physical Silver Trust (PSLV) invests and hold substantially all of its assets in physical silver bullion. PSLV seeks to provide a secure, convenient and exchange"
The Sprott Physical Silver Trust (PSLV) is a closed-end trust that invests in unencumbered and fully-allocated London Good Delivery (“LGD”) silver bars.
Our goal is to provide a secure, convenient and exchange-traded investment alternative for investors who want to hold physical silver.
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