I am sure you will draw in a specific type of client that will appreciate your approach to coffee. There are a number of shops that offer $15-$20 dollar cups on occasion throughout the US. I guess the biggest thing behind that would be to never roast too much with it being so expensive and limited in quantity. You can always say you are out of something for the day if you run out of the high end bean you roasted. . . . . Intelli does it all the time. That is what helps drive supply and demand
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Did you say you are opening up in Brooklyn? If so, that is like food artisan central right now. Everybody makes everything themselves and the end result is usually a much better product than what you get form the big man. I am sure word will spread quickly as to what you are offering that no one else is.