there are only two potential outcomes in regards to wire and what it does to the signal. the signal is either changed or not, and any change will always be a degradation. imo prices for wire are determined by the consumer market being targeted.
When we connect a load to a source we ALWAYS degrade the signal - it is basic electronics. What we can debate is how much and how we degrade it, and its effect in sound quality. And here we go again ...