High priced power cable what about the romex


I have a question that I tried to post before but for some reason it was flagged by the moderators.

I have nice looking power cable some signal, some MIT, some home made, and they look like they should do a great job, could even run a small town

My question is if you run romex from the fuse box to your high priced outlet, and then plug in your high priced powercable, how will this improve the path from the fuse box to the outlet? And if it doesnt why not just run the same romex to your HiFi.
How does a better grade power cable improve the path from the main grid.
I have heard this again and again "Your system is as good as its weakest link" So isnt the romex one of those weak
links?

I am sure there is a good responce to this and I am not trying to be negitive in regards to high priced power cords but what am I missing?
punkuk
Post removed 
Romex is everything the expensive snakeoil power cords are
Uh-huh. And the Olive Garden tastes just like the old country.
So has anyone in the forum actually put connectors on romex cable and listened to it in their system? I would be interested to know their ideas about the sound.
The last three feet is the killer according to the subjective 'phile's bible! I lost in my attempts to have Hydro-Québec rewire with audiophile grade cable from my system back to the power generating system at the dam, damn!