Yea there is a bunch of overpriced bulloney out there, but just because a company will overprice a wire or a tube amp doesn't mean that they are selling snake oil. There are genuine differences in using different transistors even. All transistors are rated differently and will sound completely different, just like tubes. Some transistors impart more noise than others. Even resistors sound different. A metal film resistor will sound completely different than a carbon for instance.
This audio critic seems to be implying that a cheap amp made exclusively with carbon resistors, cheap capacitors, cheap transistors, etc. will sound the same as a great tube amp made with elna silmic caps and vintage carbon resistors, like the ones used in old Marantz amps. I think he went overboard a bit, and I wouldn't take that article too seriously.
To quote the audio critic "Yes,you only have to pay a little more than rock bottom for decent plugs, shielding, insulation, etc.," I do believe that though he exaggerates a little with the clothes hanger part, you are blatantly misinterpreting him and missing the point made in the article.
He did say that spending a little above rock bottom for say, metal film resistors will make a difference but not spending HUGE mollah on parts which provide no audible benefit. Anyways, I'm doing a diy project and the most expensive metal film low noise resistors in the project cost only $0.15!(not like i can pass a judgement but you get the point). Fact is that in modern times and not the old days, there are much better alternatives for parts with great price to performance ratio. Anyways I do think a 15c metal film resistor is gonna outperform vintage carbon ones and so is a cheap opamp based amp outperforming tube amps costing say 5 to 10 times of the opamp based one if built properly. After all, the deciding factor in audio AND electrical performance is not the parts itself but how well integrated the circuit is. If your remain unconvinced, I again beseech you take that course in electrical engineering to find out or build an O2.
Anyways I will stop posting here since we do not want to derail this thread(oops) if you want to convince me, we can always look over your(future) AB/X results in other threads.