I don't play test tracks once, let alone over and over. If the differences aren't immediately obvious no matter what the music why would I pay anything for it? Let alone thousands? Obviously improved sound quality is my only criteria. I can give you a whole long list of things it is easy to hear that cost a lot less than what you are talking.
The good news here I guess is you can save yourself a whole lot of money going forward.
The good news here I guess is you can save yourself a whole lot of money going forward.