Quoted from Pinfidel:I can tell you where it AIN'T...Boston! Sadly.
I'd say Chi town is the heart of Pinball. Most companies started there and Stern's obviously still there and isn't the Chicago pin-fest the biggest and best of them all?
I guess you don't know about lanes & games in Cambridge and one of the best pinball arcades in the country in Pelham NH (45 minutes from Boston). There are a ton of collectors here, too.