I second those who say you must experiment; and williwonka has basically
explained why. BTW there's nothing "fanatical" about better power cords-except the pursuit of ultimate quality by those attempting to provide the best, like MIT Cable for example .If you have
a system capable of revealing the differences,listen to types of music where increased resolution, refinement and dynamics are important to you, and if you have a suitable listening environment then -if you experiment- voila ! you will understand. Elementary my dear Watson.