The article could be renamed as "Why Loudspeakers so Expensive"
When it comes to Speakers We all know the Driver,Cabinet,Xovers cost much,But the Design (Petent) for the Cabinet Design and materiel used , Materiel used for Drivers,Tweeters,Brand value,Hype given to the Brand value also takes equal cost in the MRP for the Hi end speakers.
From my experience Audio Setup is like Eco systems, It needs everything from the Proper Acoustic tested room,Source, Player\Streamer ,Amps,Cable to Speakers. So any fault in any of this chain, then there is no use having the best speaker in your Home,Since you might not get the feel what is been Advertised.
Paper,Aluminum, Silk,Titanium, Beryllium and now Diamond ,Still the Research is On to find which metal gives the flawless response and reduce the risk of Burnout in Tweeter and its applied for the Drivers too.