What is your location? Urban is definitely different from suburban. As a 26 year-old in Boston willing to burn cash as long as it makes my skiing better, I can offer you some ideas that would appeal to my demographic. If I were to open a shop, I would focus on high-end gear. First of all, high-end gear is more expensive and thus has a higher margin. Second, it's purchased by people who buy new skis once every year or two, sometimes every year. Mid to low level gear, while appealing to the masses, is purchased by people who might get new skis once every 5 years. There is also a lack of certain brands of soft goods. In particular, North Face, Acrteryx, EMS and REI seem to be the only top brands that are readily available. Helly Hansen, Sessions, Oakley, Cloudveil, Patagonia (to name a few) are incredibly difficult to find good selections of in retail stores.
Clearly, this is a not servicable business model, and of course you need the low-end stuff too, and rentals. But in general, I would go to any shop that had the gear I wanted to buy. Even in a city as big and outdoorsy as Boston, it's impossible to find exactly what I want. I usually have to go online.