Worth upgrading from stock RCA cables?

[Mr Ee]

I have purchase and returned rca cable from claiming esoteric cable that cost more than wiim itself. Firing up John Lennon imagine provide zero improvement over the rca cable that came from wiim. These company cost them a peanut to make cable and yet sell them at esoteric price. At the end of the day, the company made money and laught at you for believing such bs.

I'm both disagreeing and agreeing, and I'm definitely agreeing about the exorbitant price for some cables!
Oh, to be young and gullible again...
I have a few different rca cables at various price points, including one that cost maybe twice what an ultra costs. Let's round it to A$1,000
Could I honestly say that most expensive one is noticably better than another that cost me A$100? Not really.
Do I think both are much better than the one that came with the Pro? Yes I do, in my setup / usage anyway.