People change components and cables, looking for better sound. Reminds me of the drunk looking for his car keys under the streetlight. "Where did you lose them?" "A block that way." "Why aren't you looking there?" "The light is better here."
Often, a modest expenditure on room acoustics will provide more improvement than the latest, greatest component or (most certainly) latest, greatest wires. But not as fun as shiny new gear nor as easy to sneak into the house as new wires.