New expensive power cord for amp and no change in sound?

If power cords really made a big difference wouldn't component manufacturers be putting better stock cords on?  Are there any component manufacturers that put anything other than standard plastic covered cords in the box?  

@jon5f52  , this might be an apples to oranges comparison, but not way long ago someone asked the same thing about tubes--to paraphrase, "Why don't manufacturers send out their stuff with high dollar tubes?"  And almost everyone will concede that different tubes do sound different.  So I'd almost think that instead of sending an amp out with a real expensive power cord to add to the msrp, they let the consumer pick & choose how much $ to spend to tailor his or her sound to his or her liking.

If you deem a $500 power cord , it's pretty safe to say your system is fairly entry level

It's safe to say you have a warped sense of priorities.

@immatthewj To me that bumps up against the problem of why does different have to cost so much.  I understand people like to switch tubes and compare.  When it turns into you need to try this simple mechanical device that just happens to cost $4,000 I lose interest.  It feels too much like exploiting OCD, which we all have at least a little.

There are amps that are not reacting to any power cord switching  , regardless of the price. I have couple of amps that did this to me.Though that was 20 yrs ago.Maybe my listening skills is not yet there to figure out the change.