Some of us at the stereo store where I worked in the '80s wanted to do something like this, although not a higher-end store. We had decent equipment, but at that time, the high end was very exclusive, more limited and I doubt the manufacturers would have wanted to be associated with a bar that sold their brands. Another reason our Big Toe (Sgt Hulka, from the movie 'Stripes') didn't want to do this- it was the beginning of people suing employers for crashing their car after getting hammered at work or company-sponsored events and he didn't want the liability. I guess people could sign a waver, but I think they would stick about as well as an NDA after leaving a company.
This is intended for people who are more upscale, right? I think a wine/spirits bar could work, maybe with a cigar room and WRT alcohol, limit the customers to one or two drinks. Nobody wants to deal with people who had a few before showing up and the last two become the tipping point- I have dealt with people who came in when drunk, whether it was obvious, or not. It's also possible that someone who has a low threshold could decide they want to return the equipment, saying they weren't able to make a good decision because of the drinks.
Another question- what if they come and don't buy? At some point, it could become just a bar with a really nice stereo and those already exist.
It's a cool idea, but has anyone asked people in this age group if they would be interested?
Another possible issue/problem- what happens when high end audio customers have their opinions on which accessories are better but the dealer sells other brands and neither is willing to budge? How high is this high end?
Retail is a fickle business- regardless of someone's reasons for carrying the brands they have selected, someone will always come in wanting something else, armed with reviews from some nimrod who has an audience, but no clue. Also, and this comes from dealing with wealthy people who want AV systems- they don't all want to spend a huge amount, even though it wouldn't impact their bottom line. They want to perceive value, just like many others and if they find something for less, you can bet that they'll buy it, even if they have a fairly long relationship with someone. OTOH, if they like someone who has worked with/for them, they WILL refer others to those dealers/companies and I have benefited directly from this; I'm working on two houses, both referrals, one direct and the other is from a third party. As it turns out, almost all of the people I have worked with since 2003 know each other, probably due to their association with where they work, the symphony, art museum, charity organizations, tennis clubs, personal interests and through mutual friends. That kind of network can yield great benefits and it's important to remember that if they're treated well, it can last a long time but if you piss one off, it can end overnight.
I'm not trying to rain on anyone's parade, but having been in retail for almost 50 years, ideas for what would be an interesting model and the reality of the business don't always meet constructively- a local musician who has recorded and toured with hugely popular and successful acts for several decades opened a music store and they had a lot of great equipment, events and a more upscale-looking store. It didn't last long unfortunately, even though the manager had decades of experience running that kind of business, the sales people were very experienced musicians and they knew how to use the equipment very well.