In the real world it is the point you can't afford or are unwilling to pay for a subjectively minimal improvement. Of course this will vary from one individual to the next as noted. Hanging around this site ensures acceleration of this progressive disease. If someone could please save us the time and let us know if they have discovered "real" yet, I would be much obliged.
Law of Diminishing Returns; where does it kick in?
I think that most of us who have been in this hobby for a while have experienced the "law of diminishing returns", the point at which spending a lot more money produces a little bit better sound or just tradeoffs.
I would like your opinions on where you believe this occurs in Speakers, Amps, CD players, and cabling.