Here is a true story from the web. A guy has two systems, one cost a million dollars.(the speakers being the most expensive pieces).and the other is a modest system. Groups of people heard both and most everyone liked the sound of the modest system suggesting the million-dollar system was more analytical, and not as musical.
How good is good enough?
Most of us here cannot afford six figure prices for each component (assuming that will bring the best sound.) So how far do we want to go to improve our systems? There are always bigger fish. When does it stop? It stops when we say it stops, when our gear brings us satisfaction. To constantly strive for better sound is an endless quest, not necessarily based on the quality of our set but on our personality.