Velvett
Typically, the price range of the food determines the target audience. (Long Island is a little different because it's so wealthy, true but still)
If it costs $150 for two people for dinner, your target is generally a little bit of an older crowd, and the ambience should reflect that. You're not getting 25 year olds in there at those prices, typically. (You might if this is the Hamptons).
Ambience is a distant third to food quality and quality/attentiveness of staff in my opinion.