The market for expensive digital cables exists because people do not understand the nature of digital signal transmission.
I disagree - as with AGW/CC (anthropogenic global warming/climate change),
"pathological audiophiliac consumerism" is a malady that cannot be reversed by simple knowledge and logic alone.
We humans often display strange sets of illogical behaviors, and it seems that the only effective manipulation techniques that have been deployed to effectively exploit these traits are by marketers and politicians - and usually not for purposes that benefit our species as a whole.
"Why" people believe debunked ideas and concepts - and things like audio fairy tales - is fairly well understood, but it seems as difficult to treat and/or reverse as physical addiction to opioids or belief in debunked conspiracy theories.
My love of science and music, and my interest in human psychology make ASR a fun place to hang out. Like AGW/CC discussion forums at science-based climate and meteorology websites a few years ago when denialism among meteorologists and severe weather followers was rampant, we get a fair number of defensive audio subjectivists showing up, some of whom demand scientific and logical explanitions, but when confronted with these explanations, demonstrate that they do not understand science and logic. I see occasional attempts here to promote unscientific subjectivism - even in this thread - and were countered respectfully in most cases. I am pleased with the predominance of science and engineering objectivism by most of our old-timers and regulars.
In this thread I have learned a lot about the basic physics and engineering of both optical and USB cables, and the comments seem to support my selection of my current favorite brand of USB cables and chargers (and 3.5mm audio cables) - the inexpensive, well designed and engineered Anker brand from Amazon. However, Anker does not offer Toslink optical cables. Then again, I have never had a problem with my motley collection of cheap and/or "included free" optical cables.