I'll back my statement up with some evidence...
Cambridge Audio, for example, supply all their components with a standard power cord, yet make a point of NOT including interconnects. That clearly means they have no issue with a standard PC, but know buyers will want to select their own IC.
Carl109, your only evidence is that the Cambridge Audio or Creek gear do not respond to sonic changes with varying power cords. That's an indication of the electronics here, not that power cables are a con.
This would be like someone expecting that putting 91-octane gasoline into a Toyota Corolla would make a performance improvement compared to the 85/87-octane that was "recommended" by the manufacturer. The user would detect no change and therefore there is evidence that higher octane gasoline was a con. NOT!
I posed a similar question a while back, asking if eliminating interconnects altogether by using fully integrated systems (like the Arcam CD/Pre/power) was an advantage.
There are pros/cons of integrated vs. separates but it's not going to be because of the use or not use of ICs....other than a cost issue. I would suggest that you consider moving up to the next level of performance in your electronics choices before you put any attention to cables. Until then, you will continue to convince yourself that cables are a con.