The way you tested the cable is incorrect. I would check how your doing things.
Anyways, next time go to radio shack, buy some nice gold connectors that work with your speakers (they have almost every type available), then go to your local hardware store, and buy some nice lamp cord. Attach connectors to lamp cord, and you will have your own home made cable that will sound as good as the most expensive MIT speaker cable available.
When a salesman or audio installer asks/tells you about their speaker cable, simply tell him your not interested. If he talks about "HighEnd" RCA, Coaxil or component cable, ask him the price; If its above $20, tell him your not interested. If he talks about "HighEnd" HDMI, DVI, SPDIF (optical or coaxil sound cable), tell him to shut the... well you get the idea.
Ok, fine... People can state that their MIT speaker cable and their high end co-axil speaker cable is better. The companies might have scientific proof, or have people tested with extreme hearing ability tell you that its better. Some people have told me that its the "Feel" rather then a direct ability to tell the difference. This may be true for Analog signals, however for digital signals any claim of beign "High End" is simply a load of steaming.... well again you get the idea.
Ever open up your speakers? Take out a driver... look at the speaker wire inside the system. Is it gold plated, with high amounts of silver and other materials in them, or is it simple electrical wire... DING DING DING you are correct, it is simple electrical wire!
Sorry, but on Audioholics, their is very little support for these cable manufacturers. For me personally, I take what these companies are doing as major minipulation of the general uneducated public. I feel these companies are selling snake oil to people, and it really hurts people. I feel that these companies are unethical, and I would be ashamed to sell someone any of this stuff. In addition I would not work or associate myself with these companies. I feel that strongly about this that I feel a hole in my chest that humans can be so manipulating.
This is my opinion... I happen to like my burgers from Wendy, and would never go to McDonalds for anything. My coffee is always black, and I dont need sugar for "Im sweet enough"... I also love Oreo cookies, and can eat a whole bag in about 30 minutes. These Oreo cookies are like crack, I just cant get near them... Im going to go to Oreo cookie rehab. I hear that many people love thoose chips ahoy with some milk, and though I agree they are good, I must say that Oreo's are better. Sometimes I need a change and I go to the Chips Ahoy's. I love to dunk these in milk. I dont like Ice Cream, though my father loves it more then anything else.