Dear BVdiman,
I sell 3 brands; Audioquest, Kimber and Purist Audio. Often I sell 1 or 2 cables. It is only a part of a set. These cables are compared with others most of the time.
When I know what equipment a client owns and what he wants to change I bring in a cable which will fit into his demands. I work very precise.
My focus is on how I see what should be the blueprint of the absolute sound. I have already written this. I use these cables and brands to achieve this.
I sold Nordost for over 9 years of time. And sold a lot Valhalla in the past. Owned it for over 12 years of time. Nordost does not have all parts in one cables which I need for the absolute sound. That is why I sold it often with Kimber cables togheter in ther past. To make it more complete. Blacks and a small and intimate individual focus of instruments are the weakest points of Nordost. I can demo this very precise why it is not complete.
I use properties of cables to make a set more complete. The same as I use the properties of amps, sources, speakers and conditioners etc. That is a different approach.
I would never recommend to use cables from one brand. The synergie stories are one of the biggest bullshit stories in audio. It is not about what they say but about what you hear.
That is why the best and most convincing sound Always will win. And that makes audio a lot more easy.