Folks, I fully understand that brick and mortar stores create value by having the skill to integrate components that create system synergy and great sound. I also value their skill to work on turntables and other tricky gear. But, with margins approaching 50% on high end gear, I question if the store provides me with $20,000 added value (at a minimum) on a $50,000 pair of speakers. You look, you hook them up to the right gear, and you listen. If you're lucky, it sounds good at home.
On the used side, dealers take a lot of gear on consignment, thereby creating a near zero cost of goods sold (other than the previously mentioned lights and staff). There can be quite a spread between what the original seller gets and the new owner pays. That spread goes to the dealer.
If I were younger, and the market were growing, I would get into this business, and run it a lot like Reno HiFi does; in home demos at no cost (other than shipping) and great customer service. I would have a modest or virtual storefront. The days of inventory heavy stores in affluent urban areas are numbered, for sure. Good thing I am getting old, and my gear is pretty new...