There are 270+ Apple stores in the US, I don't have the figures to hand but an overwhelming percentage of the country's actual population live within an hour of an Apple store. They are common, frankly.
I'm not defending the decision to require a store visit here, but lets not paint a picture of Apple store availability that doesn't exist. The number of people with disposable income in the US to purchase a 3500 dollar headset and actually want to buy one who aren't living under an hour from an Apple store is likely a very small list.