Transparent makes some excellent audio cables, I have some in my system here (not those specifically) and they DO influence and change the sound. It's all a matter of where are the bottlenecks in your system and what that system is ultimately capable of.
Am I going to run out and spend $1000 on an audio cable? Nope, absolutely not, but if I were looking to spend $30,000 on a pair of speakers then maybe I would. The cabling is a part of the signal path from source to speaker/display and it does matter just like any other link in the chain. It's all a matter of cost vs. results.