Some of it is audiophile in the very high end, but the Capresso is definitely not where I would consider the edge of diminishing returns. It uses pretty mediocre burrs with a considerable amount of plastic and a poor grind adjustment mechanism. I used to own one and upgrading got me substantially better coffee.
I had once a collegue at work who said, "I pity you that you need to drink expensive coffee, I can't taste the difference" My taste tops out at $600 grinders.
Funny, although I pity someone who can’t taste the difference between truly hugely different coffees. At some point it becomes like saying you can’t taste the difference between a Merlot and a Chardonnay wine. I can respect someone who says they just prefer “boring” cheap coffee, but they’re kidding themselves if they’d try to say there isn’t a clear difference. Even the smell is blatantly obvious.