Cheap silver interconnect and cables are incredibly harsh. Good silver cables require a lot of design work with the kind of wire, geometry and dielectric casing. Maybe there is more to it than that. Silver cables have been both the very worst cables I have heard and the very best. The very best were real Nordost Odin 2... simply stunning... not remotely harsh, detailed and natural... $17K a pair.
Pure Silver Wire
If silver is so good to use why do we not see solid silver speaker cables? Price is not that high- 10ga diameter pure silver 6ft is just under $300. That makes a pair of speaker cables about $1,100 for material. I see the price of some of these cables on the market and $1,100 is a fraction of their asking price.