If your power line already has added parasitic feeds (called parasitic current or voltage) , then a power cable cannot remove them however expensive it might be.
In the water filter analogy as mentioned by
@keith_correa the water filter had a filtration circuit to remove the impurities, but I am not aware of any cable that has such circuitry built in it except an added in ferrite ring in some cables. Nor am I aware of any cable company including any kind of filtration circuit in the cable.
The only feature mentioned by these high cable offerings are usually about thickness, extrusion methodology, cryogenic treatment etc. plus some added insulation features to reject external interference.
MY suggestion with power line is to use a combination of a spike buster and a conditioner (the spike before the conditioner) to clean out the power line. If budget does nit afford a conditioner, then use an isolation transformer. This will clean out the DC.
Regarding USB cable, I have observed that some cheaper cables are not able to establish the handshake between the source and the DAC. though they might work as a printer USB cable
With USB one factor I have noticed is that keeping the cable length short helps a lot.
Since my upper most budget on USB cable was 1000 bucks, I purchased one well reviewed 6 inch cable from Aliexpress and it is working quite well with my DAC.