I wonder if any of the people who buy expensive cables for their HT setups have ever taken apart any of their preamps, receivers, or amplifiers, and looked at the components inside.
No matter how expensive they are, whenever there is need for a wire to be run, they use plain old wire on the inside. Plain old copper wire. How many hundreds of feet of wire do you think is wrapped in a transformer?
Look at powered subs. Take them apart and look at the wire they use to go from the amp to the driver. Plain old copper wire.
Then tell me that some fat, expensive wire from one component to another will help. Total B.S.