My guess is most of them work downtown and stop in the restaurant/bar to wait out traffic before driving home. And all the employees seem to drive to work. Plus the multitude of (baseball, basketball, arts & entertainment, convention center) venues around.

At first I just considered the parking hassles a "free-wifi tax" but then they added a second popular sandwich shop/bar next door and it just snowballed from there. Oh, and I lost the free-wifi benefit so now it's all just pure hassle.