It’s not that copper sounds bad, but silver gives more lifelike detail. That, for 2K - 4K in used deals, was well worth it to me - the next level up in components is not going to be achievable for that little extra amount.
This mirrors my experience with high quality silver cabling. In addition to the "lifelike detail", I experience increased openness, air and a more convincing natural tone and timbre. System, component and wire quality dependent of course.
Charles