Just thinking aloud here but if spending more on cables is sufficient to make a buyer believe their system sounds better, then the secret of improving our systems is revealed. Wish it were that simple.
More seriously, invest in some samples from the Cable Co as Ghosthouse says above, and have at it. Nothing like comparing different cables in your own rig and room to learn how much impact cabling might have for your ears. You'll save money in the long run and give yourself an education. If so inclined, try some A/B testing with friends too, but don't confuse that with relaxed listening, unless of course your idea of relaxed listening is cable testing. To each their own.
More seriously, invest in some samples from the Cable Co as Ghosthouse says above, and have at it. Nothing like comparing different cables in your own rig and room to learn how much impact cabling might have for your ears. You'll save money in the long run and give yourself an education. If so inclined, try some A/B testing with friends too, but don't confuse that with relaxed listening, unless of course your idea of relaxed listening is cable testing. To each their own.