Re: Missing the obvious test
What it does do is stop your connections oxidizing.
It's also soft, so sprung connectors make better contact, but it only works if both connectors are gold of a decent thickness. A super-thin layer of gold on one connnctor is pointless, and if the other is a standard nickel-plated one there's even some chance of electrolytic action making the nickel side oxidise faster, if there's moisture around. If you're building stuff to milspec, gold contacts have advantages. For domestic hifi it's just bling, and a way to relieve suckers of their money.