I worked at a high end audio shop for a few years. I saw everything from $80,000 audio /cables/ to $150,000 turntables. There is a lot of snake oil, but articles like this upset me for two reasons.
Firstly, the lumping of "audiophiles". Most of the people who refer to themselves as such are nut balls (in my experience). There were a few that were great and heard amazing ears, but most of the time - nut balls. Guys that spent more time listening to tone recordings and day dreaming about their own perfect setup then they did actually listening to music.
Secondly, there /is/ a difference in wire/speaker box/electrical source/whatever - but it doesn't mean that the more expensive one is better. It is about synergy. Quick example: I had a pair of small rega speakers with a set of $5,000 nordost speaker cables. Sounded awful - worse than a car radio. I swapped it out for the set of the generic cables that came with it - blew away half the speakers in the shop that were two to ten times the price. There were also times when the /best/ sound really was a tube amp with separate power drop, acoustical treated wall, and the whole shebang. Every little change you make makes a difference, every solder joint counts.
Do yourself a favor if you are at all interested in this, and stop by your local big city hi-fi shop (not best buy, magnolia or any other chain, something that has upwards of $10k speakers in stock preferably) and try out the different sets. You will be swayed.