Power Conditioner vs A/C cables


Here's my question...Is it necessary to buy expensive power cables downstream of a high-end power conditioner?
What do they do that hasn't already been done?  As long as you don't go so cheap you degrade the signal.
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PS Audio offers a line of power generators that suits most budget needs. The after market AC power cords will benefit them because these generators are more like amps than conditioners. I have the P15 and use a AQ power cord and they work great in my system. 
Would it be necessary to use a power conditioner if you use a portable power supply like Eco Delta and the likes? AC noise from your appliances or anything else in your home would be isolated as the unit would only be plugged in to charge. Any ideas?
I suggest you pursue this on Audio Science Review, a site that doesn’t subscribe to witchcraft. Most Audiogon contributors can’t waste enough money on ridiculous accessories touted by unscrupulous dealers.