Not all power cords are created equal. The range of performance and price is vast. You must however consider your baseline. Freebie power cords shipped with components are such awful crap just about any power cord at any price even the crappiest most overpriced crap will almost certainly be a huge improvement.
But even more to the point, if you're running freebie cords, then whatever amount of money you put into power cords will buy you more improvement than that same amount of money could possibly get you if spent on a component. Got it? Any $500 power cord beats a $500 more expensive component. Until you replace those factory freebie cords it is probably even true that no amount of money is enough to overcome what you could get from what you have right now, only plugged into something like a Synergistic Research Master Coupler.
And yes the same holds for every single component in your system. You would be shocked to find how much you can spend before this even starts to change in favor of spending more on the component. Shocked.
But even more to the point, if you're running freebie cords, then whatever amount of money you put into power cords will buy you more improvement than that same amount of money could possibly get you if spent on a component. Got it? Any $500 power cord beats a $500 more expensive component. Until you replace those factory freebie cords it is probably even true that no amount of money is enough to overcome what you could get from what you have right now, only plugged into something like a Synergistic Research Master Coupler.
And yes the same holds for every single component in your system. You would be shocked to find how much you can spend before this even starts to change in favor of spending more on the component. Shocked.