IMO it comers down to a few things. I have not had a cable "transform" the sound in my system. I do hear differences and have preferences though. But in my reality, the equipment I use typically has a dedicated overbuilt power supply so I think that is a factor in what I hear. My equipment is where I get my sound from and the cables just add a slight flavor to the system. I also can change the sound of my system through my preamp that has 5 difference sets of output resistors so I can change the sound if the recordings are that different so cables make a little less of a difference and by using the resistors I also am able to customize the sound so I don't need different cables for different recordings. That being said, the only cable I use of any value is a digital cable and although it makes my system sound better, I have also used a cheap interconnect for a digital cable that also sounds really good and if it wasn't for a friend lending me the cable. I would not feel that the sound of my system is missing anything. All my power cords are heavy gauge molded ended power cords and I use any interconnects that I have laying around.
Happy Listening.
Happy Listening.