1. If it's not an audible improvement, then it's obviously not an "improvement", or at least, not an aural improvement, though possibly a visual improvement. Measurements are very useful and can (depending on what we're measuring and what the measurements are) tell us all we need to know but other times, measurements may be inconclusive, in which case we have to look elsewhere for an answer and by far the most reliable place is some form of DBT.
2. I object to your classification system and clearly defining me as an objectivist. The main reason I love my work as an audio engineer is because it's almost entirely about subjectivity; making subjective evaluations and then creating subjective corrections/modifications based on those subjective evaluations. Few jobs are as subjective as mine and I'm paid for my subjective abilities. I am in fact therefore a subjectivist, the exact opposite of what you're tying to classify me as!!
3. "Very high price" is a weapon audiophiles commonly use in a futile attempt to make a some point or other. It's futile and foolish for two reasons: 1. The point it most commonly proves is nothing other than how gullible/susceptible to marketing BS they are and 2. It's a pathetic, puny little weapon compared to the weapons many of us (you're calling "objectivists") routinely use. My speaker system cost about $30,000 and I've spent around double that figure on acoustics. I regularly work in rooms/systems which cost over $1m and occasionally in ones which cost $20m or so.
Despite my own roughly third of a million dollar environment and my experience in other commercial environments costing nearly 100 times more than that, I've never bought (or seen in any other studio) a USB cable which cost more than about $10! Compared to the hundreds of thousands or millions spent, a few grand for a USB cable is a relatively insignificant amount money which we would/could easily purchase if such a USB cable actually made any difference but as expensive USB cables don't make even the tiniest of audible differences, I (and the far more costly studios) would far rather spend our money on items which do actually make a difference or not spend it in the first place! Bare in mind that even a relatively modest facility like mine has to spend at least $1k-$2k on cables any way, so it's nothing to do with any aversion to spending money on cables, where it makes a difference!!
So please, enough of the "high-end" and other nonsense because I doubt you've ever experience really high-end!
G