Do ground lifters alter sound?


Beyond getting rid of hum, can they degrade what a good cable is doing?
My dad and I installed new gear from Esoteric, VPI, and Audio Research along with all Audioquest cables including the mid-level power cords and we had hum so we lifted the grounds to curb the problem, we used cheap lifters found at Wallmart so I got curious of others opinions, are higher quality lifters available and if there are wich I assume is the case, do they make a diffrence in sound?
Half of me says such a small surface area in the lifter wouldnt affect sound but the other half thinks it is a bit silly to put a $0.25 lifter on a $300 power cord.
Any thoughts appreciated...............Chad
chadnliz

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