Shoot me an e-mail thru my profile (requires a little detective work)
I actually have 2 stores like that in my area and if you'd like me to describe it to you over the phone/e-mail I'm more than happy to help you out. Basically it's a big endeavor but it could pay off well for you. Jaben clearly does VERY well for themselves and a lot of my facebook friends/customers also have stakes in audio stores in Singapore and I believe that something like that would take off down there. I oddly enough was born in So-cal despite living north of you so this is actually quite a coincidence that the one night I can't sleep I'm on head-fi and I stumble across this thread.
Basically it's not just about trying, it's about going to a dude and having him give you advice and it's about the customer forming a relationship and trusting you to have their interests in mind. Thats all a store is, I know how to buy things, I just need someone to meet me halfway on the other end with what to buy and what is good for my money.
What I want to see is service first and foremost. I've worked in service one way or another my entire life despite being an engineering graduate because I enjoy being in the business of people. I like talking to people, and doing what you like makes it quite a privilege to earn a living interacting with people who have an interest in the things you love. Honestly so many companies make a great product I wouldn't get tied down in EXACTLY what inventory to carry. So many people are a little myopic at certain pricepoints that if they just tried a bunch of headphones they'd see a BUNCH OF THEM end up sounding pretty good haha.
Anyway, shoot me a PM. I have no involvement with our local audio store and I've never bought anything there but I could get you in touch with 'em.