People who say it's all snake oil raise two questions for me:
1. Do you think that these cords and conditioners have just been fooling everyone for decades? And they are too stupid to realize it and too deluded to know that they are not hearing a difference? If your answer is "yes" then you have a very low opinion of thousands of audiophiles.
2. Have you tried it? And if you had and it made no difference *to you* are you then just willing to extrapolate from one example to everyone else who does hear a difference?