Do expensive cables/wires REALLY make a difference


Im fairly new to the hifi world and just recently purchased a couple of high end peices.my question is this:ive been reading alot about cables and speaker wire,do the expensive ones really make that big of a difference???Is it really worth spending a small fortune on cables?? And is Monster Cable really overrated like ive been reading? Any help would be useful,thank you.
cwby8115
I suggest a simple solution ,  wire one speaker with one brand and the other with a different brand.  See if you hear a difference and decide for your self 
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I did a review of the cheap Radio Shack 14Ga. Megacable speaker cables that were so popular years ago, and it still appears at Dagogo.com

One of the worst pieces of wire I have laid hands on.  :(
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