Best budget, high current, DIY power cord wire?

Question for the group. Mind I'm not trying to cause a ruckus but rather genuinely curious. First if it it thought that a better power cord improves things why not run a dedicated better line from the main panel in the house. ie if 5 feet of better improves things would 5o more feet improve things more?

Second my knowledge of solid state physics is way deeper than my audio understanding and or experience. Given that I'm completely at a loss why vibration isolation of a power cord should make any difference. Are there any studies out there?

AL

"2)Re vibration sensitivity of power cords, my answer, as an experienced multi-degreed electronics engineer and analog and digital circuit designer, and as a long-time audiophile, is that I don't have the slightest idea. :)"

LOL that's an answer I can completely accept!

thanks guys