That is yet another one of my questions, I am asking why/how is the pre amp section in the lex and mac superior, since that is what the owners and reviewers always say.
You may be very will right about their not being significant sonic differences to warrant the price differences. That doesn't stop others from drooling over some of the fine designs and craftsmanship of some high end amplifiers and preamps. Halcro makes some very sturdy equipment, as does McIntosh and Lexicon. I would say it's an artform. One of my personal favorites in fashionable equipment is Gryphon of Denmark, they make some of the most beautiful equipment in my eyes.
Other people love the vintage look of McIntosh, like HiFiHoney. Looking at their gear up close and personal is impressive. Is it my particular style, no, but it is stylish. It's much like the Rolex, the Prada, and other designer or high end products. Every industry has them.

Audiophiles take pride in their fancy equipment, and when they feel better about their gear I think they bias their listening to that. Someone listening to their $20,000 system gives them the satisfaction that they chose the components and made a designated system to listen to music, would it sound better than a $2000 DIY by WmAx, more than likely not, but it's the excitement of collecting.