I agree. Lots of things make a difference (including power) but they are often quite negligible. Is a dedicated digital source better than a PC? By many miles. Is a $10k source better than a $200 source? Not by nearly as much. Do line-level and speaker cables make a difference? Sure. But it's really subtle and most setups would be hard-pressed to hear anything in a blind test. If you have money to burn and the test of the setup is 10's of thousands, a cable costing a couple hundred isn't that egregious.