@immatthewj To me that bumps up against the problem of why does different have to cost so much. I understand people like to switch tubes and compare. When it turns into you need to try this simple mechanical device that just happens to cost $4,000 I lose interest. It feels too much like exploiting OCD, which we all have at least a little.
@jon_5912 , I guess it all comes down to what you get for your 4k and whether or not what you get is worth 4k to you. In this case, I think OP is saying he cannot hear ANY difference between $500 and "several k.". But perhaps in other applications the consumer might hear a difference. You asked why the manufacturers are not putting high dollar cords on their stuff that they send out if it makes a difference, and I simply think that they do not want to raise the msrp that much on an upgrade that not everyone thinks is important and wants to pay a lot for.