I can see that to a point, sure...but where's the point of diminishing returns? Where's the price where the amount of improvement you get simply isn't worth the additional outlay...especially considering that extra money poured into interconnects is an opportunity cost that's preventing you from upgrading other parts of the system like amplifiers, DACs, and of course, loudspeakers (the component that arguably has the largest impact in a system's sonic character).
"You get what you pay for" is true in some cases, but it falls apart in really high end audio because the prices are so inflated. For example - I used to own a Decware Zen EL84 SET amplifier. It was priced at $750, but sonically, could hold its own against amps priced three, four times that. Even $750 was an inflated price - you could probably assemble the thing out of parts for $300 - but it had incredible value. If I spent the extra two grand, would I have an amp worth that extra money? Sure, maybe the expensive amps had more chrome, or more brass knobs or lights, but that wouldn't make it a better amp.