What would be interesting (and if I had an extra million or two I would certainly try that business model out) is if some enterprising entrepreneurs would strike up some deals with several of the ID manufacturers and make their own store - only more of a 'demo facility'.
I know, before you say, that it would not be a huge profit-maker (and that it would be an uphill battle perhaps with most of the ID brands). But picture it if you will: a storefront with 3-4 nicely appointed listening rooms filled with nothing but ID product... in this room an Emotiva powered surround system. In a second room a pair Aperion Verus Grand Towers running off a Wyred4Sound integrated. Maybe in a third a display of 7-8 different standmount monitors from Ascend, Salk, Emotiva, Axiom, EMP Tek, etc... backed by a rear wall of subs from Epik, HSU, SVS, and the previously mentioned brands - all running off a panel of low-to-mid priced AVRs.
With a nice "coffee and conversation" atmosphere and no pressure sales. So how would such a place make enough to cover their overhead?? By providing Internet kiosks for customers to place their orders online (through custom portals that would kick back commissions to the store from the vendors themselves - something small so the price could be the same and therefore not provide a disincentive). Also how about a wall of pretty, functional, and only 200-500% marked up cables, stands, acoustic treatments, etc... sure I find cable margins to be criminal - but that's when they're in the 1000's of percent markup by snake oil salesmen. As long as there weren't any $5K interconnects which had been cryogenically treated by Rabbis on the first Saturday in May... Finally there is always plenty of money to be made in installs and support.
I know I'd be happy to pick them up at the store that gave me a chance to truly compare and contrast a number of normally physically unavailable products. Even the source of them could be ID - just buy from BlueJeans and mark up 2-5X. Sure a few people would just go online themselves when they got home - but for the most part, those people would have done that anyway. For the others, the people looking to spend $3K on a system, but not $13K or $30K - they could have that 'boutique experience' within their budget.... and if the experience was good - recommend it to everyone they knew.
Dunno if it would be a viable business - but I know I'd be there right now rather than typing this response at my desk.