Hi Sasha,
Theory generally goes like this and applies to cables that rest on artificial fiber carpet, per Pierre Sprey of Mapleshade Audio. Carpet can act like a dialetric and stores static electricity, which can be "absorbed" by your cables, negatively impacting the ability of the cable to pass a "clean" signal. For a visual comparison, think about looking through a window that hasn't been cleaned for awhile and then cleaning the window.
I've never had to do raise my interconnects / speaker cables since I've had / have wood floors. To avoid seeing the speaker cables, I've drilled a small hole through my floor and ran the speaker cable, through the crawl space, from the amp to the speaker.
For those who have wood floors, I certainly understand one's reluctance to do what I have done but I've done it for aesthetic reasons.
Bottom line:
Pretty cheap tweak that may improve your system sound. Give it a try and see what you think.
GG