One day, a few will clue in to the fact that if all they chase are marketing claims and not real substantiated audible claims,Too simplistic....
I listened some costly tweak product on youtube marketed by a well known company and it is EVIDENT that there is an audible effect....
But not necessarily an effect i would want in my system...
Anyway i replicated some of these tweaks AT LOW COST but without the artificiality in the audible effect... My device control was less powerful but more delicate in the musical effect....Then some may produce very real spectacular effect, but not necessarily something i would wanted to pay for...And anyway one could replicate some at peanuts costs....
All tweaks are not equal....
This is not fact only my own experience for sure....