.I wonder if this hype for both businesses is generated due to both being businesses being from the Northeast and people just wanting to experience something from back home or from word of mouth as I hear the New York Shake Shacks have 2 hour waits and live cameras of the lines so people know what to expect.
Seems like my childhood home of Florida is looking more like NY/NJ, all the time...

But, in reverse, a few months ago, the Midwestern favorite "Steak n' Shake" (which has been doing business in FL for many years) recently opened it's first NYC location, next door to the Ed Sullivan Theatre (David Letterman show).