It's usually cost. And yes "gold plated" is a marketing gimmick rather than a requirement
I would put silver in the same category as platinum
Copper is literally better than gold
https://www.thoughtco.com/table-of-electrical-resistivity-conductivity-608499
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I think rusting is the factor?
In certain niche situations. The overpriced monster cable sitting in between your tv and receiver isn't supposed to get wet though
