This will never happen, because the same people who are selling the hardware are also selling maybe not the insane $100,000 cables, but the $200 cables with 70% margin on them. Manufacturers don't want to alienate dealers so they're never going to tell the dealers not to push Monster or Audioquest or whatever other "upgrade cable" nonsense the dealers are pushing to pad their bottom lines.
Part of the problem too is that fierce competition has pushed margins way down - televisions are sold at basically zero margin, and it used to be the case that dealer markup was around 50% on speakers and audio gear, but I believe it's about half that now. Many of the value-add attaches that dealers used to make money on are dead or dying - fifteen years ago you'd buy a new TV for $2,000 and the dealer would make nothing, but you'd also buy a DVD player, a set of component cables, and a universal remote for another $400 and the dealer would make 50% on that. These days, TVs typically go out the door with *zero* additional sales, or maybe a soundbar at a 10% markup.
If boutique dealers want to stay in business against big box stores and online retailers, they have to pad their margins and make money somewhere. Unfortunately, they're making it by ripping off their customers, rather than selling actual value-add products like room treatment.