@holmz "I assume that I do not need one because I have a lack of any noise/hiss etc when it is on, but not playing any music."
Thank you Holmz, brilliant point, assuming you run it loud. You are quite lucky if you hear nothing at all at top volume setting. My system and most others has a little low level white noise at that level. One can measure how far down it is. And test if a $1500 power cord removes or reduces it. It won't, so try a $15,000 cord. A mains conditioner might.
Changing a power cord can do nothing apart from deplete your bank balance. It makes no measurable difference to the power entering your amplifier.
Adding a conditioner can clean up your power if it is dirty. In such case it can make a measurable difference evidenced by removal of low-level noise artifacts. In extreme cases such difference can be heard, like if you're running a fridge on the same circuit.
All else is hogwash. And a lot of hogs are getting washed.