Replacing/Upgrading AC Outlets

I do not understand the value of a silver plated, cryoed, or whatever, outlet. The most important thing at this end stage of the electric coming out of the wall, and the beginning stage of the electrice going to your system is the connection. Tight/ snug. That's it. I know there's a million threads on this. Remember, though, if you hear a difference:there is... I don't, so there isn't...warren