"Does a $5,000 dollar watch tell time any better than a 30 dollar watch?"
The simple answer is no. Actually the $30 watch will be + or - about 15 seconds per month where a mechanical (a real watch) will be + or - app. 10 seconds per day, depending upon variables. Would you notice this difference without testing on a watch timer? (Witschi) No.
I grew up in the Antique business and was a Watchmaker for many years. I have only vintage watches. I choose a watch for the day, give it some winds and set it. Am I synchronized with GMT standard? Not unless I happened to get very lucky. Is it important to me? no.
Will the Rolex keep better time with the installation of a Diamond Bezel? Again, obviously no.
Now the $30 dollar cable could possibly sound better than the $5,000 dollar cable in a particular given system.
Now, would a diamond encrusted cable sound better...... ?