* Espresso costs about 1 euro, 2 for cappuccino, 2.5-ish for almost any croissant/pastry.
* Customers come in order/pay, stand at a bar to have their drink, all done in about 10 minutes max.
* Staff consists of a middle-aged barista with a bow-tie who pulls flawless espresso shots like a locomotive and a surly lady who handles the money + orders.
* In the evening, add a waitress and serve a limited menu of aperitivo and some specialties.
The expectations are, of course, different in the US. I think there are ways to make it work (1), but yeah, if you want to have that special chilled-out shabby-chic space typified by independent early-90's coffee houses, be prepared to make meager precarious wages at best. Virtually all of NYC is off-limits for such enterprises now because of rent.
(1) For example, this new place in Philly, informal lunch/cafe during the day, trendy byob at night: http://www.philly.com/philly/columnists/craig_laban/20170430...