Faygo was a big deal back when it was one of the few brands with a large number of different flavors. If you lived somewhere that only had Coke, Pepsi, RC, the diet versions of the above, something citrus, and Dr. Pepper, the Faygo assortment was amazing.
Now the average grocery store has dozens of different flavors from various brands, big and small. And Faygo has nationwide distribution so it's not a big deal to be visiting the Midwest and be able to buy some when the Food Lion back in South Carolina stocks it.